Follow these Steps: It’s really easy to add this new extension in Chrome. 

Step 1: Fork the project or clone it : [git clone 'project'] command-line: git clone https://github.com/maryala9/timextension.git 

Step 2: Type “chrome://extensions” in a tab to bring up the extensions page.

Step 3: Once on this page, check “Developer mode” to enable loading unpacked extensions.        This will allow you to load your extension from a folder

Step 4:  Finally, click “Load unpacked extension” or simply drag the “timextension” folder onto the page to load up the extension. You should immediately see the extension show up as a Browser Action with your icon in the toolbar window of the current tab.

Step 5: For options 'Right click on the extension icon and click options' select the format and save it. 

Step 6: Click new tab it will be activated.