docs: add v2.2 changelog (argoproj#7681)

Signed-off-by: Alexander Matyushentsev <AMatyushentsev@gmail.com>

CHANGELOG.md

@@ -1,5 +1,67 @@
 # Changelog
 
+## v2.2.0 (Unreleased)
+
+> [Upgrade instructions](./docs/operator-manual/upgrading/2.1-2.2.md)
+
+### Project Scoped repositories and clusters
+
+The project scoped repositories and clusters is a feature that simplifies registering the repositories and cluster credentials.
+Instead of requiring operators to set up in advance all clusters and git repositories that can be used, developers can now do
+this on their own in a self-service manner.
+
+### Config Management Plugins V2
+
+The Config Management Plugins V2 is set of enhancement of the existing config management plugins feature.
+The list includes improved installation experience, ability to package plugin into a separate image and
+improved plugin manifests discovery.
+
+### Resource tracking
+
+Argo CD has traditionally tracked the resources it manages by the well-known "app.kubernetes.io/instance" property.
+While using this property works ok in simple scenarios, it also has several limitations. ArgoCD now allows you to use
+a new annotation (argocd.argoproj.io/tracking-id) for tracking your resources. Using this annotation is a much more flexible approach
+as there are no conflicts with other Kubernetes tools, and you can easily install multiple Argo CD instances on the same clusters.
+
+### Bug Fixes and Performance Enhancements
+
+* Argo CD API server caches RBAC checks that significantly improves the GET /api/v1/applications API performance (#7587)
+* Argo CD RBAC supports regex matches (#7165)
+* Health check support for KubeVirt (#7176), Cassandra (#7017), Openshift Route (#7112), DeploymentConfig (#7114), Confluent (#6957) and SparkApplication (#7434) CRDs.
+* Persistent banner (#7312) with custom positioning (#7462)
+* Cluster name support in project destinations (#7198)
+* around 30 more features and a total of 84 bug fixes
+
+## v2.1.6 (2021-11-16)
+
+- fix: don't use revision caching during app creation (#7508)
+- fix: supporting OCI dependencies. Fixes #6062 (#6994)
+
+## v2.1.5 (2021-11-16)
+
+- fix: Invalid memory address or nil pointer dereference in processRequestedAppOperation (#7501)
+
+## v2.1.4 (2021-11-15)
+
+- fix: Operation has completed with phase: Running (#7482)
+- fix: Application status panel shows Syncing instead of Deleting (#7486)
+- fix(ui): Add Error Boundary around Extensions and comply with new Extensions API (#7215)
+
+
+## v2.1.3 (2021-10-29)
+
+- fix: core-install.yaml always refers to latest argocd image (#7321)
+- fix: handle applicationset backup forbidden error (#7306)
+- fix: Argo CD should not use cached git/helm revision during app creation/update validation (#7244)
+
+## v2.1.2 (2021-10-02)
+
+- fix: cluster filter popping out of box (#7135)
+- fix: gracefully shutdown metrics server when dex config changes (#7138)
+- fix: upgrade gitops engine version to v0.4.1 (#7088)
+- fix: repository name already exists when multiple helm dependencies  (#7096)
+
+
 ## v2.1.1 (2021-08-25)
 
 ### Bug Fixes