Add feature list in README.md

Author: Chrisvin

README.md

@@ -3,3 +3,19 @@
 </p>
 
 Easy Stack Search is a lightweight extension that makes searching Stack sites like StackOverflow quick & easy.
+
+### Feature list: 
+1. Use "s" Omnibox command to search in stackoverflow from chrome address-bar. 
+<br>For example - Type "s", press space/tab, then type "SharedPreferences" and press enter to bring up the search results for "SharedPreferences" in Stack Overflow.
+
+2. Search any text you select using (right-click) context menu.
+
+3. Choose whether search result is shown in same tab or new tab. 
+
+4. Set the sort order of the search results.
+
+5. Set default filters to be applied to all searches.
+
+6. Add additional filters that will be shown as omnibox suggestions.
+
+7. Change default URL to search other sites.