add readme (#2)

Signed-off-by: oldthreefeng <louisehong4168@gmail.com>

README.md

@@ -1,5 +1,62 @@
-### Usage
+## kubectl-cns
 
-copy kubectl-cns to you path and you can
+kubectl-cns is a kubectl plugin that clean the namespace quickly. 
 
-```kubectl cns aaa dddd```
+This plugin has been tested to work with following delete types:
+
+- Delete Active namespace
+- Delete multi Active namespace
+- Delete Terminating namespace
+- Delete multi Terminating namespace
+
+## Build
+
+if you have go env. build yourself. or [download](https://github.com/cuisongliu/kubectl-cns/releases)
+
+
+```
+git clone git@github.com:cuisongliu/kubectl-cns.git
+
+go build .
+
+cp kubectl-cns $YOUR_PATH
+
+```
+
+## Usage
+
+Binary Use
+
+```
+ 
+# delete an tx namespace
+kubectl-cns tx
+
+# delete an tx namespace by force
+kubectl-cns tx --force
+
+# delete some namespaces like tx, staging
+kubectl-cns tx staging
+
+# delete some namespaces like tx, staging , qa by force
+kubect-cns tx staging qa --force
+	
+
+```
+
+As Plugin Use
+
+```
+# delete an tx namespace
+kubectl cns tx
+
+# delete an tx namespace by force
+kubectl cns tx --force
+
+# delete some namespaces like tx, staging
+kubectl cns tx staging
+
+# delete some namespaces like tx, staging , qa by force
+kubectl cns tx staging qa --force
+
+```