Add 2021 wg-multitenancy annual report

Co-authored-by: Tasha Drew <tasha.drew@gmail.com>

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+# 2021 WG Multitenancy Annual Report
+
+### What was the initial mission of the group and if it's changed, how?
+
+**Initial Mission:**
+
+Define the models of multitenancy that Kubernetes will support. Discuss and execute upon any
+remaining work that needs to be done to support these models. Create conformance tests that 
+will prove that these models can be built and used in production environments.
+
+**Current Mission:**
+
+We are focusing more on projects using Kubernetes than trying to directly change the API machinery, 
+which is a huge and potentially intractable problem. We are continuing to work on conformance 
+testing as part of one of our projects.
+
+### What’s the current roadmap until completion?
+
+**We have three projects we are incubating:**
+
+* Multi-Tenancy Benchmarks https://github.com/kubernetes-sigs/multi-tenancy/tree/master/benchmarks 
+* Virtual Cluster Project  https://github.com/kubernetes-sigs/multi-tenancy/tree/master/incubator/virtualcluster 
+* Hierarchical Namespace Controller https://github.com/kubernetes-sigs/multi-tenancy/tree/master/incubator/hnc 
+
+These are all in active development, and we’re making good progress. Google Cloud has adopted HNC in beta. 
+MTB is going to be a great platform for the conformance test suite expansion. Virtual Cluster Project is 
+graduating out of our incubator and into its own repo! HNC will probably follow soon.
+
+The roadmap is documented in the [working group project plan](https://docs.google.com/document/d/1U8RQQmTUjxgMZY05HG2f7b3KsB94BhK4Ko6aWbLNXcc/edit).
+
+### Have you produced any artifacts, reports, white papers to date?
+
+You can find a bunch of our docs here: https://github.com/kubernetes-sigs/multi-tenancy/tree/master/docs 
+
+### Is the group active? healthy? contributors from multiple companies and/or end user companies?
+
+Yes, it’s one of the most egalitarian working groups I’ve seen. We have active contributors and participants 
+from all over the industry, and a lot of drive bys from consumers of Kubernetes who are just trying to 
+configure clusters for multi-tenancy and have questions. Our incubating projects are led by people from 
+Google, Nirmata, Alibaba, and Medtronic, have reviewers and participants from other companies, and the WG chairs work at VMware and Cisco.
+We have a very diverse group of presenters from different companies who are all trying to solve the same problems, and we all have 
+the philosophy of learning from each other and sharing. 
+
+### Is everything in your readme accurate? posting meetings on youtube?
+
+Yes and Yes.
+
+### Do you have regular check-ins with your sponsoring SIGs?
+
+We have a huge number of sponsoring SIGs, many of them send representatives to meetings on an adhoc basis.
+
+### Links to the last two community meeting updates the group has given and notable highlights you’d like to share from those.
+