Reset release notes (frequenz-floss#1108)

Author: ela-kotulska-frequenz

RELEASE_NOTES.md

@@ -1,8 +1,17 @@
 # Frequenz Python SDK Release Notes
 
+## Summary
+
+<!-- Here goes a general summary of what this release is about -->
+
 ## Upgrading
 
+<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+
 ## New Features
 
-- `frequenz.sdk.config.load_config()` can now use a base schema to customize even further how data is loaded.
+<!-- Here goes the main new features and examples or instructions on how to use them -->
+
+## Bug Fixes
 
+<!-- Here goes notable bug fixes that are worth a special mention or explanation -->