Celeste 64: Add CHANGELOG.md (#2948)

worlds/celeste64/CHANGELOG.md

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+# Celeste 64 - Changelog
+
+
+## v1.1 - First Stable Release
+
+### Features:
+
+- Goal is to collect a certain amount of Strawberries and visit Badeline on her island
+- Locations included:
+	- Strawberries
+- Items included:
+	- Strawberries
+	- Dash Refills
+	- Double Dash Refills
+	- Feathers
+	- Coins
+	- Cassettes
+	- Traffic Blocks
+	- Springs
+	- Breakable Blocks
+- DeathLink is supported