Update README.md

Author: Spencer-Easton

README.md

@@ -147,6 +147,39 @@ request in the "Authorization" header.
       ...
     }
 
+### 5. Reseting the Access Token
+
+If you have an access token set and need to remove it from the property store
+you can remove it with the reset() command. Before you can call reset you need
+to pass the property store.
+
+    function clearService(){
+      OAuth2.createService('drive')
+      .setPropertyStore(PropertiesService.getUserProperties())
+      .reset();
+    }
+
+### 6. Setting the Token format mode
+
+OAuth services can return a token in two ways: as JSON or an URL encoded
+string. You can set what format the the token is in with the setTokenFormat(Mode).
+There are two ENUMS to set the mode: TOKEN_FORMAT.FORM_URL_ENCODED and TOKEN_FORMAT.JSON.
+JSON is set as default if no token format is choosen. 
+
+    function gitService() {
+      return OAuth2.createService('git')
+       .setAuthorizationBaseUrl('https://github.com/login/oauth/authorize')
+       .setTokenUrl('https://github.com/login/oauth/access_token')
+       .setClientId(PropertiesService.getScriptProperties().getProperty('ghClient_Id'))
+       .setClientSecret(PropertiesService.getScriptProperties().getProperty('ghClient_Secret'))
+       .setProjectKey('MFiKVY_UbWVN0OvyDZTwvash00DPSBbB3')
+       .setCallbackFunction('authCallback')
+       .setPropertyStore(PropertiesService.getUserProperties())
+       .setScope('gist,repo,user')
+      .setTokenFormat(OAuth2.TOKEN_FORMAT.FORM_URL_ENCODED);
+    }
+
+
 
 ## Compatiblity