Add dev env setup guide

.github/CONTRIBUTING.md

@@ -109,6 +109,42 @@ ______________________________________________________________________
 
 ## Guidelines
 
+### Development environment
+
+To set up a local development environment, begin by cloning the repository:
+
+```bash
+git clone https://github.com/Lightning-AI/lightning.git
+cd lightning
+```
+
+Once in root level of the repository, install the dependencies using a package manager of your choice:
+
+```bash
+# pip
+python -m venv .venv
+source .venv/bin/activate
+pip install ".[dev, examples]"
+
+# uv
+uv venv
+source .venv/bin/activate
+uv pip install ".[dev, examples]"
+```
+
+Once the dependencies have been installed, install pre-commit and set up the git hook scripts:
+
+```bash
+# pip
+pip install pre-commit
+
+# uv
+uv pip install pre-commit
+
+# Install git hook scripts
+pre-commit install
+```
+
 ### Developments scripts
 
 To build the documentation locally, simply execute the following commands from project root (only for Unix):