Create changelog.md

docs/changelog.md

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+# Flizzer Tracker v0.2 #
+
+## Added ##
+- Save/load instruments in separate .fzi files
+- Pattern editor now occupies full screen when you focus on it
+- Copypaste menu (hold Back to open it when focused on pattern editor), operates on whole patterns
+
+# Flizzer Tracker v0.1 #
+
+- Initial release