Update README.md

Author: self-init

README.md

@@ -1,10 +1,14 @@
 # Python GUI Calculator with CI/CD
 A simple gui calculator app written in Python and Tkinter that integrates a CI/CD pipeline.
 
-TODO
+## TODO
  - [x] Basic calculator functionality
  - [ ] Implement % button
- - [~] Multiple layouts & dynamic scaling
-    - Window scaling is implemented, multiple layouts are still WIP
+ - [ ] Multiple layouts & dynamic scaling
+    - [x] Window scaling
+    - [ ] Multiple layouts & switching based on aspect ratio
  - [ ] Tests and documentation
  - [ ] CI/CD workflow using actions
+    - [x] Automatic testing using pytest
+    - [x] Automatic testing using doctest
+    - [ ] Automatic documentation