Add configs to VectorDB docs (#1699)

docs/components/vectordbs/config.mdx

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+## What is Config?
+
+Config in mem0 is a dictionary that specifies the settings for your vector database. It allows you to customize the behavior and connection details of your chosen vector store.
+
+## How to Define Config
+
+The config is defined as a Python dictionary with two main keys:
+- `vector_store`: Specifies the vector database provider and its configuration
+  - `provider`: The name of the vector database (e.g., "chroma", "pgvector", "qdrant")
+  - `config`: A nested dictionary containing provider-specific settings
+
+## How to Use Config
+
+Here's a general example of how to use the config with mem0:
+
+```python
+import os
+from mem0 import Memory
+
+os.environ["OPENAI_API_KEY"] = "sk-xx"
+
+config = {
+    "vector_store": {
+        "provider": "your_chosen_provider",
+        "config": {
+            # Provider-specific settings go here
+        }
+    }
+}
+
+m = Memory.from_config(config)
+m.add("Your text here", user_id="user", metadata={"category": "example"})
+```
+
+## Why is Config Needed?
+
+Config is essential for:
+1. Specifying which vector database to use.
+2. Providing necessary connection details (e.g., host, port, credentials).
+3. Customizing database-specific settings (e.g., collection name, path).
+4. Ensuring proper initialization and connection to your chosen vector store.
+
+## Master List of All Params in Config
+
+Here's a comprehensive list of all parameters that can be used across different vector databases:
+
+| Parameter | Description |
+|-----------|-------------|
+| `collection_name` | Name of the collection |
+| `embedding_model_dims` | Dimensions of the embedding model |
+| `client` | Custom client for the database |
+| `path` | Path for the database |
+| `host` | Host where the server is running |
+| `port` | Port where the server is running |
+| `user` | Username for database connection |
+| `password` | Password for database connection |
+| `dbname` | Name of the database |
+| `url` | Full URL for the server |
+| `api_key` | API key for the server |
+| `on_disk` | Enable persistent storage |
+
+## Customizing Config
+
+Each vector database has its own specific configuration requirements. To customize the config for your chosen vector store:
+
+1. Identify the vector database you want to use from [supported vector databases](./dbs).
+2. Refer to the `Config` section in the respective vector database's documentation.
+3. Include only the relevant parameters for your chosen database in the `config` dictionary.
+
+## Supported Vector Databases
+
+For detailed information on configuring specific vector databases, please visit the [Supported Vector Databases](./dbs) section. There you'll find individual pages for each supported vector store with provider-specific usage examples and configuration details.

docs/components/vectordbs/dbs/chroma.mdx

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+[Chroma](https://www.trychroma.com/) is an AI-native open-source vector database that simplifies building LLM apps by providing tools for storing, embedding, and searching embeddings with a focus on simplicity and speed.
+
+### Usage
+
+```python
+import os
+from mem0 import Memory
+
+os.environ["OPENAI_API_KEY"] = "sk-xx"
+
+config = {
+    "vector_store": {
+        "provider": "chroma",
+        "config": {
+            "collection_name": "test",
+            "path": "db",
+        }
+    }
+}
+
+m = Memory.from_config(config)
+m.add("Likes to play cricket on weekends", user_id="alice", metadata={"category": "hobbies"})
+```
+
+### Config
+
+Here are the parameters available for configuring Chroma:
+
+| Parameter | Description | Default Value |
+| --- | --- | --- |
+| `collection_name` | The name of the collection | `mem0` |
+| `client` | Custom client for Chroma | `None` |
+| `path` | Path for the Chroma database | `db` |
+| `host` | The host where the Chroma server is running | `None` |
+| `port` | The port where the Chroma server is running | `None` |

docs/components/vectordbs/dbs/pgvector.mdx

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+[pgvector](https://github.com/pgvector/pgvector) is open-source vector similarity search for Postgres. After connecting with postgres run `CREATE EXTENSION IF NOT EXISTS vector;` to create the vector extension.
+
+### Usage
+
+```python
+import os
+from mem0 import Memory
+
+os.environ["OPENAI_API_KEY"] = "sk-xx"
+
+config = {
+    "vector_store": {
+        "provider": "pgvector",
+        "config": {
+            "user": "test",
+            "password": "123",
+            "host": "127.0.0.1",
+            "port": "5432",
+        }
+    }
+}
+
+m = Memory.from_config(config)
+m.add("Likes to play cricket on weekends", user_id="alice", metadata={"category": "hobbies"})
+```
+
+### Config
+
+Here's the parameters available for configuring pgvector:
+
+| Parameter | Description | Default Value |
+| --- | --- | --- |
+| `dbname` | The name of the database | `postgres` |
+| `collection_name` | The name of the collection | `mem0` |
+| `embedding_model_dims` | Dimensions of the embedding model | `1536` |
+| `user` | User name to connect to the database | `None` |
+| `password` | Password to connect to the database | `None` |
+| `host` | The host where the Postgres server is running | `None` |
+| `port` | The port where the Postgres server is running | `None` |

docs/components/vectordbs/dbs/qdrant.mdx

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+[Qdrant](https://qdrant.tech/) is an open-source vector search engine. It is designed to work with large-scale datasets and provides a high-performance search engine for vector data.
+
+### Usage
+
+```python
+import os
+from mem0 import Memory
+
+os.environ["OPENAI_API_KEY"] = "sk-xx"
+
+config = {
+    "vector_store": {
+        "provider": "qdrant",
+        "config": {
+            "collection_name": "test",
+            "host": "localhost",
+            "port": 6333,
+        }
+    }
+}
+
+m = Memory.from_config(config)
+m.add("Likes to play cricket on weekends", user_id="alice", metadata={"category": "hobbies"})
+```
+
+### Config
+
+Let's see the available parameters for the `qdrant` config:
+
+| Parameter | Description | Default Value |
+| --- | --- | --- |
+| `collection_name` | The name of the collection to store the vectors | `mem0` |
+| `embedding_model_dims` | Dimensions of the embedding model | `1536` |
+| `client` | Custom client for qdrant | `None` |
+| `host` | The host where the qdrant server is running | `None` |
+| `port` | The port where the qdrant server is running | `None` |
+| `path` | Path for the qdrant database | `/tmp/qdrant` |
+| `url` | Full URL for the qdrant server | `None` |
+| `api_key` | API key for the qdrant server | `None` |
+| `on_disk` | For enabling persistent storage | `False` |

docs/components/vectordbs/overview.mdx

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+---
+title: Overview
+---
+
+Mem0 includes built-in support for various popular databases. Memory can utilize the database provided by the user, ensuring efficient use for specific needs.
+
+## Usage
+
+To utilize a vector database, you must provide a configuration to customize its usage. If no configuration is supplied, a default configuration will be applied, and `Qdrant` will be used as the vector database.
+
+For a comprehensive list of available parameters for vector database configuration, please refer to [Config](./config).
+
+To view all supported vector databases, visit the [Supported Vector Databases](./dbs).
+
+## Common issues
+
+### Using model with different dimensions
+
+If you are using customized model, which is having different dimensions other than 1536
+for example 768, you may encounter below error:
+
+`ValueError: shapes (0,1536) and (768,) not aligned: 1536 (dim 1) != 768 (dim 0)`
+
+you could add `"embedding_model_dims": 768,` to the config of the vector_store to overcome this issue.