Update release notes

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

RELEASE_NOTES.md

@@ -12,8 +12,21 @@
 
 ## New Features
 
-<!-- Here goes the main new features and examples or instructions on how to use them -->
+- A new configuration mode was added to the resampler (and thus the resampling actor and microgrid high-level interface). When passing a new `ResamplerConfig2` instance to the resampler, it will use a wall clock timer instead of a monotonic clock timer. This timer adjustes sleeps to account for drifts in the monotonic clock, and thus allows for more accurate resampling in cases where the monotonic clock drifts away from the wall clock. The monotonic clock timer option will be deprecated in the future, as it is not really suitable for resampling. The new `ResamplerConfig2` class accepts a `WallClockTimerConfig` to fine-tune the wall clock timer behavior, if necessary.
+
+   Example usage:
+
+   ```python
+   from frequenz.sdk import microgrid
+   from frequenz.sdk.timeseries import ResamplerConfig2
+
+    await microgrid.initialize(
+        MICROGRID_API_URL,
+        # Just replace the old `ResamplerConfig` with the new `ResamplerConfig2`
+        resampler_config=ResamplerConfig2(resampling_period=timedelta(seconds=1.0)),
+    )
+    ```
 
 ## Bug Fixes
 
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->
+- When using the new wall clock timer in the resampmler, it will now resync to the system time if it drifts away for more than a resample period, and do dynamic adjustments to the timer if the monotonic clock has a small drift compared to the wall clock.