DF-838:Added workflow for etna-rosetta (#1489)

README.md

@@ -94,6 +94,39 @@ Create a super user:
 dj createsuperuser
 ```
 
+## ETNA-ROSETTA WORKFLOW
+
+### entna-rosetta Branch, Environment:
+- etna-rosetta is branched off `ds-wagtail:develop`
+- is a long running branch which contains changes made for ROSETTA API (develop contains changes for KONG API)
+- it is also an environment which is branched off develop
+- it will be merged into develop when KONG API is decommissioned to use, or for some other reason.
+- brings in new changes from develop
+- adds any specific changes for Rosetta
+- a CD will initiate to deploy to `etna-rosetta` for any merges into `etna-rosetta`
+
+
+### Syncing entna-rosetta with channges from develop
+
+Option 1
+- create a branch off `etna-rosetta` eg: chore/sync-ddmmyyy
+- merge develop branch into chore/sync-ddmmyyy
+- fix conflicts
+- create PR into `etna-rosetta`
+
+Option 2
+- merge develop into `etna-rosetta`
+- fix conflicts
+
+
+### Feature changes/fixes for entna-rosetta
+
+- create feature,fix ticket branches off `etna-rosetta`
+- merge latest changes from `etna-rosetta` into the feature branch
+- create PR into `etna-rosetta`
+- test feature in a spare environment if available
+
+
 ## Issues with your local environment?
 
 Check out the [Local development gotchas](https://nationalarchives.github.io/ds-wagtail/developer-guide/local-development-gotchas/) page for solutions to common issues.