Add readme file

Author: Stigmatoz

README.md

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+# Web Activity Time Tracker <a href="https://chrome.google.com/webstore/detail/web-activity-time-tracker/hhfnghjdeddcfegfekjeihfmbjenlomm" rel="nofollow"><img src="https://user-images.githubusercontent.com/768070/51865757-87d45300-2347-11e9-84fd-bafff5b036b2.png" alt="Add to Chrome" style="max-width:100%;"></a>
+![image](https://user-images.githubusercontent.com/23387046/63031188-4b6bdd00-bebc-11e9-9706-3dc57568b163.png)
+
+Web Activity Time Tracker keeps track of how much time you spend on the web and presents the stats in a useful and intuitive way. 
+You can set a daily visit limit for sites and block it after the expiration of the limit. 
+
+Extension uses only local [chrome.storage API](https://developer.chrome.com/apps/storage) chrome.storage API to store data and it does't send data anywhere.
+
+If you have suggestions or problems using the extension, please [submit a bug or a feature request](https://github.com/Stigmatoz/web-activity-time-tracker/issues).
+
+# Chrome Web Store
+
+Web Activity Time Tracker is available via the official [Chrome Web Store](https://chrome.google.com/webstore/detail/web-activity-time-tracker/hhfnghjdeddcfegfekjeihfmbjenlomm).
+
+# Install as an extension from source
+
+1. Download the latest available version and unarchive to your preferred location (whichever suits you).
+2. Using Google Chrome browser, navigate to chrome://extensions/ and enable "Developer mode" in the upper right corner.
+3. Click on the "Load unpacked extension..." button.
+4. Browse to the src directory of the unarchived folder and confirm.
+
+# License
+
+This work is licensed under a GNU General Public License v3.0