Add contributing guide [skip ci]

Author: jg-rp

CONTRIBUTING.md

@@ -0,0 +1,61 @@
+# Contributing to Python JSONPath RFC 9535
+
+Hi. Your contributions and questions are always welcome. Feel free to ask questions, report bugs or request features on the [issue tracker](https://github.com/jg-rp/python-jsonpath-rfc9535/issues) or on [Github Discussions](https://github.com/jg-rp/python-jsonpath-rfc9535/discussions). Pull requests are welcome too.
+
+**Table of contents**
+
+- [Development](#development)
+- [Documentation](#documentation)
+- [Style Guides](#style-guides)
+
+## Development
+
+We use [hatch](https://hatch.pypa.io/latest/) to manage project dependencies and development environments.
+
+Run tests with the _test_ script.
+
+```shell
+$ hatch run test
+```
+
+Lint with [ruff](https://beta.ruff.rs/docs/).
+
+```shell
+$ hatch run lint
+```
+
+Typecheck with [Mypy](https://mypy.readthedocs.io/en/stable/).
+
+```shell
+$ hatch run typing
+```
+
+Check coverage with pytest-cov.
+
+```shell
+$ hatch run cov
+```
+
+Or generate an HTML coverage report.
+
+```shell
+$ hatch run cov-html
+```
+
+Then open `htmlcov/index.html` in your browser.
+
+## Documentation
+
+Documentation is currently in the [README](https://github.com/jg-rp/python-jsonpath-rfc9535/blob/main/README.md) and project source code only.
+
+## Style Guides
+
+### Git Commit Messages
+
+There are no hard rules for git commit messages, although you might like to indicate the type of commit by starting the message with `docs:`, `chore:`, `feat:`, `fix:` or `refactor:`, for example.
+
+### Python Style
+
+All Python files are formatted using [Black](https://github.com/psf/black), with its default configuration.
+
+Docstrings must use [Google style docstrings](https://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html).

README.md

@@ -6,7 +6,7 @@ We follow <a href="https://datatracker.ietf.org/doc/html/rfc9535">RFC 9535</a> s
 
 <p align="center">
   <a href="https://github.com/jg-rp/python-jsonpath-rfc9535/blob/main/LICENSE.txt">
-    <img src="https://img.shields.io/pypi/l/jsonpath-rfc9535?style=flat-square" alt="License">
+    <img src="https://img.shields.io/pypi/l/jsonpath-rfc9535.svg?style=flat-square" alt="License">
   </a>
   <a href="https://github.com/jg-rp/python-jsonpath-rfc9535/actions">
     <img src="https://img.shields.io/github/actions/workflow/status/jg-rp/python-jsonpath-rfc9535/tests.yaml?branch=main&label=tests&style=flat-square" alt="Tests">
@@ -97,7 +97,7 @@ products = jsonpath.find("$..products.*", data).values()
 ## Links
 
 - Change log: https://github.com/jg-rp/python-jsonpath-rfc9535/blob/main/CHANGELOG.md
-- PyPi: [TODO](https://pypi.org/project/jsonpath-rfc9535)
+- PyPi: https://pypi.org/project/jsonpath-rfc9535
 - Source code: https://github.com/jg-rp/python-jsonpath-rfc9535
 - Issue tracker: https://github.com/jg-rp/python-jsonpath-rfc9535/issues