Contributor Section

Added a contributor/thanks section to the ReadMe document.

ReadMe.md

@@ -14,9 +14,17 @@ too much away from its original design or intent. This slight improvement adds
 three things to the default experience bar:
 
 ## Features
+
 1. Adds actual experience numbers and/or a progress percentage value above the
 experience bar. The default configuration is to show both.
 2. Prevents the experience bar from automatically hiding after changing back to
 the normal game view. The transparency value is configurable.
 3. Temporarily shows the amount of experience gained below the experience bar.
 The duration of this is configurable.
+
+## Contributors
+
+Special thanks to the following developers for continuing support of this addon:
+
+* [Arthmoor](https://github.com/Arthmoor)
+* [Shadowfen](https://github.com/Shadowfen)