Added Slack Channel link

Author: adamkleingit

Diff for: docs/index.html

@@ -25,6 +25,7 @@
 					<ul class="menu">
 						<li><a target="_blank" href="https://angular2-tree.readme.io/docs">Documentation</a></li>
 						<li><a target="_blank" href="https://goo.gl/forms/Pder7Bl4K4xdn7pW2">Get An Estimate</a></li>
+						<li><a target="_blank" href="https://angular-tree-component.herokuapp.com/"><img src="https://angular-tree-component.herokuapp.com/badge.svg" alt="slack" ></a></li>
 						<li><a target="_blank" class="github-button" href="https://github.com/500tech/angular-tree-component" data-size="large" data-show-count="true" aria-label="Star 500tech/angular-tree-component on GitHub">Star</a></li>
 					</ul>
 				</nav>