docs: add COLLABORATION.md mapping branches and database tables

COLLABORATION.md

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+# 🤝 RIT Freshers Hub Collaboration Guide
+
+Welcome to the team! This guide explains how to get set up, which Git branch you should work on, and which database tables you are responsible for.
+
+---
+
+## 🚀 Step 1: Getting Started
+
+1. **Clone the repository**:
+   ```bash
+   git clone <your-repository-url>
+   cd "Freshers Hub"
+   ```
+
+2. **Select your module's branch**:
+   Find your assigned module below, and check out your branch:
+   ```bash
+   git checkout feature/<your-branch-name>
+   ```
+
+3. **Install frontend dependencies**:
+   ```bash
+   npm install
+   npm run dev
+   ```
+   *(The frontend dev server will run on http://localhost:5173)*
+
+4. **Connect your Spring Boot backend to PostgreSQL**:
+   Configure your local `src/main/resources/application.properties`:
+   ```properties
+   spring.datasource.url=jdbc:postgresql://localhost:5432/rit_freshers_hub
+   spring.datasource.username=your_postgres_username
+   spring.datasource.password=your_postgres_password
+   spring.jpa.hibernate.ddl-auto=validate
+   ```
+
+---
+
+## 📋 Step 2: Module to Branch & Database Table Mapping
+
+| Assignee Name | Portal Module | Git Branch Name | Database Table(s) to Use |
+| :--- | :--- | :--- | :--- |
+| **Friend 1** | 📚 Notes & PYQs | `feature/notes-pyqs` | `notes_pyqs` |
+| **Friend 2** | 🤖 AI Fresher Assistant | `feature/ai-assistant` | `ai_chat_messages` |
+| **Friend 3** | 🗺️ Campus Map | `feature/campus-map` | `campus_locations` |
+| **Friend 4** | 🚌 Bus Routes | `feature/bus-routes` | `bus_routes`, `bus_stops` |
+| **Friend 5** | 👩‍🏫 Faculty Directory | `feature/faculty-directory` | `faculty` |
+| **Friend 6** | 💬 Freshers Q&A | `feature/freshers-qa` | `community_questions`, `community_answers` |
+| **Friend 7** | 🎉 Clubs & Events | `feature/clubs-events` | `clubs`, `events` |
+| **Friend 8** | 🧰 Student Toolkit | `feature/student-toolkit` | `toolkit_items` |
+| **Friend 9** | 🤫 Anonymous Confession | `feature/anonymous-confessions` | `confessions` |
+
+---
+
+## 🛠️ Step 3: Git Workflow Guidelines
+
+To ensure smooth merging into `main` later without conflicts, please follow these rules:
+
+1. **Keep commits focused**: Only commit changes relating to your assigned module.
+2. **Sync with Main regularly**: Before committing or pushing, merge the latest `main` into your branch to stay up to date:
+   ```bash
+   git fetch origin
+   git merge origin/main
+   ```
+3. **Pushing code**:
+   ```bash
+   git push origin feature/<your-branch-name>
+   ```
+4. **Merge to Main**: When your module is fully tested and complete, create a Pull Request on GitHub to merge your feature branch into `main`.