Document cluster-addons repository

Sub-project of sig-cluster-lifecycle
	(https://github.com/kubernetes/org/issues/630)

Signed-off-by: Daniel Holbach <daniel@weave.works>

sig-cluster-lifecycle/README.md

@@ -101,6 +101,9 @@ The following subprojects are owned by sig-cluster-lifecycle:
 - **minikube**
   - Owners:
     - https://raw.githubusercontent.com/kubernetes/minikube/master/OWNERS
+- **cluster-addons**
+  - Owners:
+    - https://raw.githubusercontent.com/kubernetes-sigs/addon-operators/master/OWNERS
 
 ## GitHub Teams
 

sigs.yaml

@@ -942,6 +942,9 @@ sigs:
     - name: minikube
       owners:
       - https://raw.githubusercontent.com/kubernetes/minikube/master/OWNERS
+    - name: cluster-addons
+      owners:
+      - https://raw.githubusercontent.com/kubernetes-sigs/addon-operators/master/OWNERS
   - name: Contributor Experience
     dir: sig-contributor-experience
     mission_statement: >