Rewrite changelog to markdown file

Author: ZoltePudeleczko

script.kodi.geforcenow/changelog.md

@@ -0,0 +1,16 @@
+v.1.2 
+- Rewrite changelog to markdown file
+- Update language file 
+- Code clean-up
+
+v.1.1
+- Added an option in settings to control whether or not stop playback in Kodi
+- Fixed how using a custom executable works
+- General code clean-up
+
+v.1.0
+- First Release
+- English language provided
+- Addon finds NVIDIA GeForce NOW in it's default location if installed
+- Automatically stops any playback from Kodi
+- In settings user can input a custom location