📚 Template: add basic developer instructions

Author: mbercx

template/docs/developer.md.jinja

@@ -0,0 +1,35 @@
+# Developer Guide
+
+## Hatch
+
+We use [Hatch](https://hatch.pypa.io/latest) to set up environments and scripts for most developer tasks.
+To see a table of the available environmens and their scripts, run:
+
+    hatch env show
+
+### Documentation
+
+The easiest way to work on the documentation is to start the server locally via:
+
+    hatch run docs:serve
+
+And go to the provided URL.
+If you only want to build the documentation locally, there is also a script for that:
+
+    hatch run docs:build
+
+{%- if doc_deploy == 'github' %}
+
+A GitHub action is set up to automatically deploy the documentation to GitHub Pages.
+See [the corresponding GitHub Pages documentation](https://docs.github.com/en/pages/getting-started-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site#publishing-from-a-branch) for the steps required.
+{%- endif %}
+
+### Pre-commit
+
+You can install the [pre-commit](https://pre-commit.com/) hooks with:
+
+    hatch run precommit:install
+
+Or run them via:
+
+    hatch run precommit:install