add emctl proposal

Author: Poorunga

docs/OWNERS

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+approvers:
+  - Poorunga
+reviewers:
+  - Poorunga

docs/images/proposals/emctl.png

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+# emctl
+
+EdgeMesh provides a command line tool for deployment, uninstallation, status detection and interaction with the cluster: `emctl`.
+
+## Installation
+TODO
+
+## Commands
+
+|Command|Syntax|Description|
+|----|----|-------|
+|[install](#install)|`cmctl install [flags]`|Deploy EdgeMesh system in the cluster, including components: edgemesh-server and edgemesh-agent.|
+|[uninstall](#uninstall)|`cmctl uninstall [flags]`|Remove EdgeMesh system from the cluster.|
+
+### install
+<img src="../images/proposals/emctl.png"/>
+
+The `install` command deploy EdgeMesh system in the cluster, including components: edgemesh-server and edgemesh-agent.
+
+Tool `emctl` will do the following things:
+- Check if KubeEdge version is >=1.6
+- Enable the `dynamicController` module of CloudCore
+- Deploy the `emctl-servant` pod to each node
+- After the node is prepared, create the corresponding configmap, deploy edgemesh-server and edgemesh-agent
+
+Pod `emctl-servant` will do the following things:
+- Check if KubeEdge version is >=1.6
+- Enable `metaServer` module and disable `edgeMesh` module of EdgeCore
+- Feedback the task completion status to `emctl`
+
+### uninstall
+TODO