Add release notes

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

RELEASE_NOTES.md

@@ -1,17 +1,17 @@
 # Frequenz Component Graph Release Notes
 
-## Summary
+## Upgrading
 
-<!-- Here goes a general summary of what this release is about -->
+- The PV, battery, CHP, EV and Wind Turbine formulas now prefer meters as the primary components and fallback to inverters or other corresponding components only when the meters are not available.
 
-## Upgrading
+  This makes a big difference in performance when there are multiple PV inverters behind a single meter, for example.
 
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+  This behaviour can be changed with the newly introduced meter preference config flags.
 
-## New Features
+- Consumer formulas don't consider phantom loads by default anymore.  The original behaviour is still available through a config flag.
 
-<!-- Here goes the main new features and examples or instructions on how to use them -->
+## New Features
 
-## Bug Fixes
+- This introduces a new consumer formula generator that doesn't consider phantom loads.
 
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->
+  Meters with successors can still have loads not represented in the component graph.  These are called phantom loads.