[UPD] add changelog

Author: plieb

CHANGELOG.md

@@ -0,0 +1,17 @@
+# Change Log
+All notable changes to this project will be documented in this file.
+
+---
+
+## [0.5.3](https://github.com/RecastAI/SDK-ios/releases/tag/0.5.3)
+
+#### Features
+
+* Add Changelog
+
+## [0.5.2](https://github.com/RecastAI/SDK-ios/releases/tag/0.5.2)
+
+#### Features
+
+* SDK Swfit
+* Update README