Add suggested shortcut

Author: wdhongtw

README.md

@@ -18,6 +18,9 @@ Markdown text will send into your clipboard.
 
 The link text is generated from current tab title.
 
+Use `Alt` + `F` To as a shortcut to activate this action.
+(You can change this key binding in <chrome://extensions/> )
+
 ## Reference
 
 - [What are extensions? - Google Chrome](https://developer.chrome.com/extensions)

manifest.json

@@ -10,5 +10,12 @@
   "browser_action": {
     "default_title": "Get Markdown URL"
   },
+  "commands": {
+    "_execute_browser_action": {
+      "suggested_key": {
+        "default": "Alt+F"
+      }
+    }
+  },
   "manifest_version": 2
 }