refactor: Add config for init, app and query (#158)

README.md

@@ -265,6 +265,64 @@ _The embedding is confirmed to work as expected. It returns the right document,
 
 **The dry run will still consume tokens to embed your query, but it is only ~1/15 of the prompt.**
 
+# Advanced
+
+## Configuration
+Embedchain is made to work out of the box. However, for advanced users we're also offering configuration options. All of these configuration options are optional and have sane defaults.
+
+### Example
+
+Here's the readme example with configuration options.
+
+```python
+import os
+from embedchain import App
+from embedchain.config import InitConfig, AddConfig, QueryConfig
+from chromadb.utils import embedding_functions
+
+# Example: use your own embedding function
+config = InitConfig(ef=embedding_functions.OpenAIEmbeddingFunction(
+                api_key=os.getenv("OPENAI_API_KEY"),
+                organization_id=os.getenv("OPENAI_ORGANIZATION"),
+                model_name="text-embedding-ada-002"
+            ))
+naval_chat_bot = App(config)
+
+add_config = AddConfig() # Currently no options
+naval_chat_bot.add("youtube_video", "https://www.youtube.com/watch?v=3qHkcs3kG44", add_config)
+naval_chat_bot.add("pdf_file", "https://navalmanack.s3.amazonaws.com/Eric-Jorgenson_The-Almanack-of-Naval-Ravikant_Final.pdf", add_config)
+naval_chat_bot.add("web_page", "https://nav.al/feedback", add_config)
+naval_chat_bot.add("web_page", "https://nav.al/agi", add_config)
+
+naval_chat_bot.add_local("qna_pair", ("Who is Naval Ravikant?", "Naval Ravikant is an Indian-American entrepreneur and investor."), add_config)
+
+query_config = QueryConfig() # Currently no options
+print(naval_chat_bot.query("What unique capacity does Naval argue humans possess when it comes to understanding explanations or concepts?", query_config))
+```
+
+### Configs
+This section describes all possible config options.
+
+#### **InitConfig**
+|option|description|type|default|
+|---|---|---|---|
+|ef|embedding function|chromadb.utils.embedding_functions|{text-embedding-ada-002}|
+|db|vector database (experimental)|BaseVectorDB|ChromaDB|
+
+#### **Add Config**
+
+*coming soon*
+
+#### **Query Config**
+
+*coming soon*
+
+#### **Chat Config**
+
+All options for query and...
+
+*coming soon*
+
 # How does it work?
 
 Creating a chat bot over any dataset needs the following steps to happen