Add Changelog

Author: pbowyer

CHANGELOG.md

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+# Changelog
+
+## [2.1.0](https://github.com/capacitor-community/camera-preview/compare/v2.0.0...v2.1.0) (2022-03-06)
+
+### Features
+
+* Add pinch and zoom support on iOS. Thank you to contributors @luckyboykg and @guischulz! ([#204](https://github.com/capacitor-community/camera-preview/pull/204))
+
+### Documentation
+* Add info on styling when the camera preview doesn't display because it's behind elements. Thank you to contributor @dhayanth-dharma! 
+* Fix deprecated imports in README. Thank you to contributor @koen20!
+* Document the iOS-only `enableHighResolution` option. Thank you to contributor @bfinleyui! ([#207](https://github.com/capacitor-community/camera-preview/pull/207))