Add screenshot

Author: jjonescz

README.md

@@ -2,3 +2,10 @@
 
 [Git Time Metric](https://github.com/git-time-metric/gtm) plugin for [Visual
 Studio](https://visualstudio.com/).
+
+## Features
+
+Currently, this plugin only reports your interaction in Visual Studio to GTM and
+shows the time spent on the current file in the status bar:
+
+![GTM time in status bar](img/status-bar.png)