Add todo

Author: frou

README.md

@@ -46,4 +46,11 @@ To close all of them, click the `×` icon on any one of them, or press the keybo
 
 As well as via keyboard shortcuts, this package's commands are also made available in the *Command Palette*. Type "Git Blame" into it to find them:
 
+<!--
+@todo Add a Development section to the README with tips for contributors
+@body Because of the layout of the package (single "plugin", `boot.py`, and the result of the code in `src/`) it's recommended to use https://packagecontrol.io/packages/AutomaticPackageReloader so that changes you make during development get picked up without needing to restart ST.
+@body Try to format the Python code using https://github.com/psf/black.
+@body Be mindful of ST API versions https://www.sublimetext.com/docs/api_reference.html. We support ST3 (build 3211+) for now, but may go ST4 exclusive in the future.
+-->
+
 ![Screenshot](https://raw.githubusercontent.com/frou/st3-gitblame/master/docs/screenshot-palette.png)