Add ghost schema

Author: 2color

mysql/ghost/README.md

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+# Ghost 
+
+Schema dump exported via [docker-compose](https://gist.githubusercontent.com/2color/0768d165a59876dd4873c20e5e0eb53f/raw/ab50a56e172dc3f7c056762465c17d366b204370/ghost_stack.yaml)
+
+- MySQL Version: 5.7.29
+- Ghost version: 3.7.0
+- Website: https://ghost.org