[DOC] Update dev logs with current tasks and progress

Added "Doing" section highlighting ongoing tasks like code compression and GemPy posterior visualization. This improves clarity on current development efforts.

Author: Leguark

docs/dev_logs/2025_May.md

@@ -15,6 +15,9 @@
 - [ ] Revive magnetics
 - [ ] Add Simon's example
 
+### Doing:
+- [ ] Compressing code
+- [ ] GemPy posterior visualization
 
 ### Possible Design:
 - Geological Model