Action API Readme Added (#884)

* action API readme added

* #798 action api documentation added

* Delete alarms.md

Author: shreya024

api-samples/action/action.md

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+# Action
+
+This sample demonstrates the use of Action API which changes the badge text,icon,hover text or popup page depending on the user's choice or action.
+
+[chrome.action_API_Link]('https://developer.chrome.com/docs/extensions/reference/action/')
+
+## Overview
+
+This sample demonstrates the Action API by allowing the user to perform the below actions:
+
+- Toggle Enabled State : to enable or disable the extensions' action button in Chrome's toolbar and menu.
+- Change Popup Page : to change the popup page by entering a new string or url.
+- Badge Text : to insert a text overlay with a solid background color.
+- Icon Image : to change the action button's icon.
+- Hover Text : it is visible when mousing over the extension's icon.
+
+## Implementation Notes
+
+The user can set values to implement above functionalities from [here]('../demo/index.html')