add changelog

CHANGELOG.md

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+# Changelog
+
+# main
+
+# ref-4.2
+
+Release targeting Isaac Sim 4.2
+
+- Added modular state capture
+- Added state writer class
+- Added state reader class
+- Added support for H1
+- Added support for Jetbot
+- Added support for Spot 
+- Added support for Carter
+- Added keyboard teleop scenario
+- Added gamepad teleop scenario
+- Added path following scenario
+- Added random acceleration scenario
+- Added initial OV extension for launching scenarios and recording data
+- Added replay rendering scripts
+- Added data loading examples
+- Added workflow documentation