Add CHANGES and UPGRADE files.

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+Upgrading to v0.0.1
+==================
+This release completely changes the database schema and so requires upgrading
+it before starting the new version of the homeserver.
+
+The script "database-prepare-for-0.0.1.sh" should be used to upgrade the
+database. This will save all user information, such as logins and profiles, 
+but will otherwise purge the database. This includes messages, which
+rooms the home server was a member of and room alias mappings.
+
+Before running the command the homeserver should be first completely 
+shutdown. To run it, simply specify the location of the database, e.g.:
+
+  ./database-prepare-for-0.0.1.sh "homeserver.db"
+
+Once this has successfully completed it will be safe to restart the 
+homeserver. You may notice that the homeserver takes a few seconds longer to 
+restart than usual as it reinitializes the database.
+
+On startup of the new version, users can either rejoin remote rooms using room
+aliases or by being reinvited. Alternatively, if any other homeserver sends a
+message to a room that the homeserver was previously in the local HS will 
+automatically rejoin the room.