update doc

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

README.md

@@ -1,6 +1,6 @@
 # 🚀 SSH for GitHub Actions
 
-[GitHub Action](https://developer.github.com/actions/) for executing remote ssh commands.
+[GitHub Action](https://github.com/features/actions) for executing remote ssh commands.
 
 ![ssh workflow](./images/ssh-workflow.png)
 
@@ -11,14 +11,22 @@
 Executing remote ssh commands.
 
 ```yaml
-- name: executing remote ssh commands using password
-  uses: appleboy/ssh-action@master
-  with:
-    host: ${{ secrets.HOST }}
-    username: ${{ secrets.USERNAME }}
-    password: ${{ secrets.PASSWORD }}
-    port: ${{ secrets.PORT }}
-    script: whoami
+name: remote ssh command
+on: [push]
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+    - name: executing remote ssh commands using password
+      uses: appleboy/ssh-action@master
+      with:
+        host: ${{ secrets.HOST }}
+        username: ${{ secrets.USERNAME }}
+        password: ${{ secrets.PASSWORD }}
+        port: ${{ secrets.PORT }}
+        script: whoami
 ```
 
 output:
@@ -38,7 +46,7 @@ Successfully executed commands to all host.
 see the [action.yml](./action.yml) file for more detail imformation.
 
 * host - scp remote host
-* port - scp remote port
+* port - scp remote port, default is `22`
 * username - scp username
 * password - scp password
 * timeout - timeout for ssh to remote host, default is `30s`

action.yml

@@ -6,6 +6,7 @@ inputs:
     description: 'ssh remote host'
   port:
     description: 'ssh remote port'
+    default: 22
   username:
     description: 'ssh username'
   password: