Create changelog.md

changelog.md

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+Lite XL is following closely [rxi/lite](https://github.com/rxi/lite) but with some enhancements.
+
+This files document the differences between Lite XL and rxi/lite for each version.
+
+### 1.08
+
+- Subpixel font rendering, removed gamma correction
+- Avoid using CPU when the editor is idle
+
+### 1.06
+
+- subpixel font rendering with gamma correction