Add CHANGELOG

CHANGELOG.rst

+Changelog
+=========
+
+`2.0a2`_
+------
+
+New features
+~~~~~~~~~~~~
+
+* Ask questions
+* Feedback
+* Frequently asked questions
+* Report issues
+
+Bugfixes
+~~~~~~~~
+
+* None
+
+Minor changes
+~~~~~~~~~~~~~
+
+* None
+
+_`2.0a2`: https://edugit.org/AlekSIS/Official/AlekSIS-App-Hjelp/-/tags/2.0a2