Create CHANGELOG.md

Author: jcs090218

CHANGELOG.md

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+# Change Log
+
+All notable changes to the "vscode-shader" extension will be documented in this file.
+
+Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
+
+## 0.1.3 (Unreleased)
+> Released N/A
+
+* N/A
+
+## 0.1.2
+> Released Nov 18, 2023
+
+* fix: VSCode marketplace image link with absolute path
+
+## 0.1.1
+> Released Nov 18, 2023
+
+* Update VSCode marketplace documentation
+
+## 0.1.0
+> Released Nov 18, 2023
+
+* Initial release
+
+## 0.0.0
+> Released Nov 17, 2023
+
+* Working release