Added a readme and screenshot of Domain Counts (#82)

domain_counts/README.md

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+# Domain Counts
+
+Totals up the number of configured extensions, voicemail boxes, ring groups and the like, with the ability to export all this data to a CSV so you can open it in your favorite spreadsheet software!
+
+![Image of Domain Counts](Domain-Counts-Overview.png)
+
+## Installation
+This was tested with FusionPBX 4.5.1 (current master at time of writing) and will likely work on newer or slightly older versions of FusionPBX.
+
+Clone the FusionPBX-Apps repo into the working path after SSHing/Moshing into your server:
+
+```
+git clone https://github.com/fusionpbx/fusionpbx-apps.git
+cd /var/www/fusionpbx/app
+cp -r ~/fusionpbx-apps/domain_counts .
+```
+
+Then navigate to your FusionPBX install and choose Advanced => Upgrade, check Menu Defaults and press Execute.
+
+At this point, Status => Domain Statistics should appear after you log out and log back in.