Add CONTRIBUTING.md

Author: devbijay

CONTRIBUTING.md

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+# 🤝 Contributing to FastAPI-Cap
+
+Thank you for your interest in contributing to **FastAPI-Cap**!  
+We welcome bug reports, feature requests, documentation improvements, and code contributions.
+
+---
+
+## 🛠️ Development Setup
+
+### 1. Fork & Clone the Repository
+
+```bash
+git clone https://github.com/your-username/fastapi-cap.git
+cd fastapicap
+```
+
+### 2. Install Development Dependencies
+
+We recommend using [uv](https://github.com/astral-sh/uv) for fast, modern Python dependency management, but you can also use `pip`.
+
+#### Using uv (recommended)
+
+```bash
+uv sync --dev
+```
+
+#### Or, install manually with pip
+
+```bash
+pip install \
+    httpx>=0.28.1 \
+    mkdocs-material>=9.6.14 \
+    mkdocstrings[python]>=0.29.1 \
+    pytest>=8.4.1 \
+    pytest-asyncio>=1.0.0 \
+    pytest-xdist>=3.7.0 \
+    testcontainers>=4.10.0
+```
+
+---
+
+## 🧪 Running Tests
+
+Make sure you have a docker running as the unit test will create test container:
+
+
+_Then run the test suite:_
+
+```bash
+pytest
+```
+
+You can also run tests in parallel for faster feedback:
+
+```bash
+pytest -n auto
+```
+
+---
+
+## 📝 Code Style
+
+- Please follow [PEP8](https://www.python.org/dev/peps/pep-0008/) and use Ruff for formatting.
+- Type hints are required for all new code.
+
+---
+
+## 📚 Documentation
+
+- Documentation is built with [MkDocs Material](https://squidfunk.github.io/mkdocs-material/).
+- To serve the docs locally:
+
+```bash
+mkdocs serve
+```
+
+---
+
+## 🙏 Thank You
+
+Your contributions make FastAPI-Cap better for everyone!  
+If you have any questions, open an issue or start a discussion.
+
+---