Document how to install from git

docs/contributing/workflow.md

@@ -79,6 +79,20 @@ Generate the documentation for Furo into the `build/docs` folder. This (mostly)
 - Run `nox -s release`
 - Once that command succeeds, you're done!
 
+## Installing directly from the repository (development)
+
+```sh
+# Clone the repository
+git clone https://github.com/pradyunsg/furo.git
+cd furo
+# Build the static assets
+npm install
+./node_modules/.bin/gulp build
+# Install with pip
+pip install .
+```
+
+
 [github flow]: https://guides.github.com/introduction/flow/
 [nox]: https://nox.readthedocs.io/en/stable/
 [jinja2]: https://jinja.palletsprojects.com