Added AGENTS.md

.gitignore

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 debian/*.debhelper
 debian/*.substvars
 debian/python3-damaris/
-
-# Agent metadata
-AGENTS.md

AGENTS.md

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+# python3-damaris
+
+## GUI Purpose and Operation
+This is the front end part of GUI for controlling NMR spectrometers. On "Start", the experiment script executes and creates XML job files. A backend, not in this code, executes these jobs sequentially adn writes the results as XML files. The front end consumes these result files using the result script.
+
+## Guidelines
+1. Use the .venv python3 environment
+5. Old code was ported from gtk2 and python2.7. This code has to work on python 3.11 and above, as well as GTK3
+2. Be aware the targeted Debian versions are bookworm, trixie, and forky.
+3. Only use packages and libraries available in Debian bookworm, trixie, and forky. Make sure that the code is compatible with all of these versions.
+3. Do not commit changes (with git) or write commit messages without asking the user.
+4. Try to minimize code changes, do not use elaborate checks for defensive programming. Ask the user if something should be tested with unit tests.
+6. Use the python unittest module for unit tests, not pytest
+7. Functions for the experiment script belong to the src/damaris/experiments/Experiment.py file
+8. Functions for the result script belong in the files in the src/damaris/data/ folder
+9. The gitea workflow can be found at .gitea/workflows/debian-build.yml
+10. to not edit anything in "build", it is regenerated
+11. Use sphinx for documentation, autodoc and autosummary is used for references of all classes, functions and modules. 
+12. If a new function/method is created document a short usage the doc/api_reference.rst and a longer explanation in doc/manual.rst