Move changelog to a dedicated file

Author: mortinger91

CHANGELOG.md

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+# ChangeLog
+This project is now refactored. (from v1.0.0)
+
+Changes:
+- Rewritten in pure C99
+- No external dependencies
+- Uses a lot less memory & no dynamic memory allocation
+
+Breaking Changes:
+- `recorder` removed because it's irrelevant. It will become a separate project
+- Command chaining and `sleep` are removed because this should be your shell's job
+- `ydotool` now must work with `ydotoold`
+- Usage of `click` and `key` are changed
+
+Good News:
+- Some people can finally build this project offline
+- `key` now (only) accepts keycodes, so it's not limited to a specific keyboard layout
+- Now it's possible to implement support for different keyboard layouts in `type`