sig-etcd: add etcd-manager subproject

Author: mrbobbytables

sig-etcd/README.md

@@ -77,6 +77,10 @@ Public etcd Discovery Service
 Distributed reliable key-value store for the most critical data of a distributed system
 - **Owners:**
   - [etcd-io/etcd](https://github.com/etcd-io/etcd/blob/main/OWNERS)
+### etcd-manager
+etcd manager
+- **Owners:**
+  - [kubernetes-sigs/etcd-manager](https://github.com/kubernetes-sigs/etcd-manager/blob/main/OWNERS)
 ### etcd-play
 etcd playground
 - **Owners:**

sigs.yaml

@@ -1750,6 +1750,10 @@ sigs:
       a distributed system
     owners:
     - https://raw.githubusercontent.com/etcd-io/etcd/main/OWNERS
+  - name: etcd-manager
+    description: etcd manager
+    owners:
+    - https://raw.githubusercontent.com/kubernetes-sigs/etcd-manager/main/OWNERS
   - name: etcd-play
     description: etcd playground
     owners: