Reset release notes after release

Signed-off-by: Flora <[email protected]>

Author: flora-hofmann-frequenz

RELEASE_NOTES.md

@@ -1,5 +1,17 @@
 # Frequenz Client Common Library Release Notes
 
+## Summary
+
+<!-- Here goes a general summary of what this release is about -->
+
 ## Upgrading
 
-* Upgrading metric `__init__` to names from api-common release [v0.6.0](https://github.com/frequenz-floss/frequenz-api-common/releases/tag/v0.6.0)
+<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+
+## New Features
+
+<!-- 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 -->