I04_1-172:

 - release notes updated

Author: UrszulaNeuman

docs/release-notes/release-notes-dev.md

@@ -5,10 +5,17 @@ Changes merged into master
 --------------------------
 | Jira Task | GitHub Issue | Type | Description |
 |-----------|--------------|------|-------------|
-| I04_1-143 | [#63](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/62) | Minor | Record summary table color changes. |
+| I04_1-143 | [#62](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/62) | Minor | Record summary table color changes. |
+| I04_1-172 | [#64](https://github.com/DiamondLightSource/PuckBarcodeReader/issues/64) | Minor | New Start/Stop scan button added. |
 
 Change Types:
 * Major - Backward incompatible change
 * Minor - Backward compatible change in API/functionality
 * Patch - Bug fix, no change in functionality
 
+A new start/stop scan button has been added to the gui.
+The button allows users to start/stop the scan.
+The layout of the button changes accordingly to the state of the scanner:
+- green start for when the scanner is stopped
+- red stop for when the scaner is running
+