chore: add root CHANGELOG index

Author: shairez

CHANGELOG.md

@@ -0,0 +1,11 @@
+# Changelogs Index
+
+Here is an index file of all the changelogs in this repo:
+
+Package | File
+--- | ---
+`qwik` | [Changelog](packages/qwik/CHANGELOG.md)
+`qwik-city` | [Changelog](packages/qwik-city/CHANGELOG.md)
+`eslint-plugin-qwik` | [Changelog](packages/eslint-plugin-qwik/CHANGELOG.md)
+`create-qwik` | [Changelog](packages/create-qwik/CHANGELOG.md)
+