Add contribution docs (#2294)

docs/contributing/documentation.mdx

@@ -0,0 +1,55 @@
+---
+title: Documentation
+icon: "book"
+---
+
+# Documentation Contributions
+
+## 📌 Prerequisites
+
+Before getting started, ensure you have **Node.js (version 23.6.0 or higher)** installed on your system.
+
+---
+
+## 🚀 Setting Up Mintlify
+
+### Step 1: Install Mintlify
+
+Install Mintlify globally using your preferred package manager:
+
+<CodeGroup>
+
+```bash npm
+npm i -g mintlify
+```
+
+```bash yarn
+yarn global add mintlify
+```
+
+</CodeGroup>
+
+### Step 2: Run the Documentation Server
+
+Navigate to the `docs/` directory (where `docs.json` is located) and start the development server:
+
+```bash
+mintlify dev
+```
+
+The documentation website will be available at: [http://localhost:3000](http://localhost:3000).
+
+---
+
+## 🔧 Custom Ports
+
+By default, Mintlify runs on **port 3000**. To use a different port, add the `--port` flag:
+
+```bash
+mintlify dev --port 3333
+```
+
+---
+
+By following these steps, you can efficiently contribute to **Mem0's documentation**. Happy documenting! ✍️
+