Add the MAINTANERS.md.

Signed-off-by: GitHub <[email protected]>

MAINTAINERS.md

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+# Maintainers
+
+## [OCM](https://github.com/open-cluster-management-io/ocm)
+* General maintainers:
+    * Jian Qiu (Redhat, @qiujian16)
+* Maintainers for specific areas:
+    * `registration`
+        * Le Yang (Redhat, @elgnay)
+        * Wei Liu (Redhat, @skeeey)
+        * Zhao Xue (Redhat, @xuezhaojun)
+    * `work`
+        * Le Yang (Redhat, @elgnay)
+        * Jian Zhu (Redhat, @zhujian7)
+    * `placement`
+        * Le Yang(Redhat, @elgnay)
+        * Qing Hao (Redhat, @haoqing0110)
+    * `operator`
+        * Jian Zhu (Redhat, @zhujian7)
+        * Zhiwei Yin (Redhat, @zhiweiyin318)
+        * DONG BEIQING (@dongbeiqing91)
+    * [multicluster-controlplane](https://github.com/open-cluster-management-io/multicluster-controlplane)
+        * Chunlin Yang (Redhat, @clyang82)
+
+## API, SDK and Tools
+* [addon-framework](https://github.com/open-cluster-management-io/addon-framework)
+    * Jian Qiu (Redhat, @qiujian16)
+    * Le Yang (Redhat, @elgnay)
+    * Zhiwei Yin (Redhat, @zhiweiyin318)
+    * Jian Zhu (Redhat, @zhujian7)
+* [sdk-go](https://github.com/open-cluster-management-io/sdk-go/blob/main/OWNERS)
+    * Jian Qiu (Redhat, @qiujian16)
+* [clusteradm](https://github.com/open-cluster-management-io/clusteradm)
+    * Jian Qiu (Redhat, @qiujian16)
+
+## Integrations and Offical support Addons
+* [multicloud-integrations](https://github.com/open-cluster-management-io/multicloud-integrations)
+    * Mike Ng (Redhat, @mikeshng)
+* [argocd-pull-integration](https://github.com/open-cluster-management-io/argocd-pull-integration)
+    * Mike Ng ( @mikeshng)
+* [cluster-proxy](https://github.com/open-cluster-management-io/cluster-proxy)
+    * Zhao Xue (Redhat, @xuezhaojun)
+* [managed-serviceaccount](https://github.com/open-cluster-management-io/managed-serviceaccount)
+    * Jian Zhu (Redhat, @zhujian7)
+* [multicluster-mesh](https://github.com/open-cluster-management-io/multicluster-mesh)
+    * LongLong Cao (Redhat, @morvencao)
+    * Chunlin Yang (Redhat, @clyang82)