Added OATControl changelog

Author: ClutchplateDude

Software/OpenAstroTracker ASCOM/OATControl/Changelog.md

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+**V0.9.9.13 - Updates**
+- Improved detection of connection error conditions.
+
+**V0.9.9.12 - Updates**
+- Added Pitch and Roll display to connection dialog (if Digital Level present)
+
+**V0.9.9.11 - Updates**
+- Adapted manual slewing to use real units. Requires V1.8.46 or later OAT firmware.
+
+**V0.9.9.10 - Updates**
+- Changed the connect flow to allow leveling (if present) and use the GPS (if present).
+- Polar Alignment now uses levelling and has a better flow.
+
+**V0.9.9.05 - Updates**
+- Fixed a communication bug that occasionally caused issues after a slew command.
+- Added a progress bar to RA and DEC that shows how far is left to slew.
+- Added an application icon (feel free to improve it!)
+- Added two more nebula to the points of interest