new file: doc/Migrate.md

doc/Migrate.md

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+Migrating to a different Server
+===============
+
+* [Home](help)
+
+## Preparation
+
+### Storage
+Check your storage backend with ``bin/console storage list`` in the root folder.
+
+If you are not currently using ``Database`` run the following commands:
+1. ``bin/console storage set Database`` to active the database backend.
+2. ``bin/console storage move`` to initiate moving the stored image files.
+
+This process may take a long time depending on the size of your storage. 
+
+### Cleaning up
+
+[Removing expired items]
+
+### Configuration files
+
+
+## Dumping DB
+
+
+## Transferring to new installation 
+