Add release notes (8.4.0)

Author: actions-user

release-docs/CFF-8.4.0.md

@@ -0,0 +1,35 @@
+# Check For Flooding Release
+
+* Version: 8.4.0
+* Proposed Release Date: 
+* Jira Release Overview: https://eaflood.atlassian.net/projects/FSR/versions/16984/tab/release-report-all-issues
+
+## Sense Check
+
+* Note that this is the definitive release notes for WebOps. The release notes in flood-service and flood-db are for CFF dev team use only.
+* Cross check the list of Jira tickets below with those in the Jira release linked to above and update where needed
+* Add additional Jira tickets from the related release notes in the 'Release 8.4.0' PR's created in:
+  * [flood-service](https://github.com/DEFRA/flood-service)
+
+* Add any required infrastructure changes such as redirects to the infrastructure changes section below
+* Once this sense check is done, delete this section
+
+## Tickets
+
+
+  
+  * FSR-1157 : Sonar Cloud issues (Take 2) (#674)
+  
+
+
+## Instructions
+
+
+  1 - Execute LFW_{STAGE}_04_UPDATE_FLOOD_APP_AND_SERVICE_PIPELINE
+
+
+Execute smoke tests and forward results
+
+## Related Infrastructure Changes Required
+
+* None