Add Changelog to project

Changelog.md

+# 2.2.0
+
+## Podmins
+* Can now pause/unpause or delete from podmin area
+
+## End Users
+* go.php auto select picks a more stable pod than before
+* Graph on user growth on the network
+* Make map prettier
+* Use lines on tables to make them more readable
+
+## Cleanup
+* Don't delete dead pods, keep them and data for history hide them for users
+* Put daily tasks in the pull.sh and run each day
+* Fix ipv6
+
+## DB
+* Add monthly stats table
+* Update status to 1-5 rather than text
+* Two migrations for this version update see db/version.md