docs: add contributing for nix users

Author: woile

docs/contributing.md

@@ -38,7 +38,7 @@ If you're a first-time contributor, please check out issues labeled [good first
     ```bash
     git remote add upstream https://github.com/commitizen-tools/commitizen.git
     ```
-4. Set up the development environment:
+4. Set up the development environment (nix users go to [nix section](#nix)):
     ```bash
     poetry install
     ```
@@ -70,6 +70,7 @@ If you're a first-time contributor, please check out issues labeled [good first
 5. **Documentation**
     - Update `docs/README.md` if needed
     - For CLI help screenshots: `poetry doc:screenshots`
+    - Prefer [Google style documentation](https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings), which works well with editors like VSCode and PyCharm
     - **DO NOT** update `CHANGELOG.md` (automatically generated)
     - **DO NOT** update version numbers (automatically handled)
 6. **Pull Request**
@@ -153,3 +154,16 @@ flowchart TD
     --modification-received-->
     review
 ```
+
+## Nix
+
+If you have installed poetry globally, the project won't work because it requries `poethepoet` for command management.
+
+You'll have to install poetry locally.
+
+```sh
+python -m venv .venv
+. .venv/bin/activate
+pip install -U pip && pip install poetry
+poetry install
+```

docs/contributing_tldr.md

@@ -12,7 +12,7 @@ Please check the [pyproject.toml](https://github.com/commitizen-tools/commitizen
 ### Code Changes
 
 ```bash
-# Ensure you have the correct dependencies
+# Ensure you have the correct dependencies, for nix user's see below
 poetry install
 
 # Make ruff happy
@@ -35,3 +35,14 @@ pytest -n auto <test_suite>
 # Build the documentation locally and check for broken links
 poetry doc
 ```
+
+### Nix Users
+
+If you are using Nix, you can install poetry locally by running:
+
+```sh
+python -m venv .venv
+. .venv/bin/activate
+pip install -U pip && pip install poetry
+poetry install
+```