feat: add CONTRIBUTING.md

Author: Cooh12

CONTRIBUTING.md

@@ -0,0 +1,54 @@
+**Development**
+After cloning the project, you'll need to set up the development environment. Here are the guidelines on how to do this.
+
+## Virtual Environment with [pdm](https://pdm-project.org/en/latest/)
+
+Create a virtual environment in a directory using Python's `.venv` module:
+
+```bash
+pdm use
+```
+That will create a `./.venv/` directory with Python binaries, allowing you to install packages in an isolated environment.
+
+# Activate the Environment
+
+```bash
+source ./.venv/bin/activate
+```
+## Installing Dependencies
+
+After activating the virtual environment as described above, run:
+
+```bash
+just install
+```
+The link to install [just](https://github.com/casey/just).
+
+If you do not want to install just, then follow these steps:
+```bash
+    pdm install -G:all
+    pip install -r docs/requirements.txt
+    pre-commit install
+```
+## Running Tests
+To run tests with your current **ASGI Monitor** application and Python environment, use:
+
+```bash
+just test
+```
+or:
+
+```bash
+pytest tests --cov=asgi_monitor --cov-append --cov-report term-missing -v
+```
+
+## Running lint
+To run lints with your current **ASGI Monitor** application and Python environment, use:
+```bash
+just lint
+```
+or:
+
+```bash
+pre-commit run --all-files
+```