Create database.backup

docs/database.backup

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+# Datbase backups
+When upgrading to new major version of Unleash it is advised to do a 
+full database backup to ease rollback in case of failures. 
+
+1. Create a database backup:
+
+```
+pg_dump --clean -U unleash_user -W -h localhost unleash > unleash-db.dump
+
+```
+
+2. Restore from a backup:
+
+```
+psql -U unleash_user -W -h localhost unleash < unleash-db.dump
+```