Added readme

README.md

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+# Overview
+
+This addon will display what game are you playing and what you are doing in the game at this momment.
+
+![preview](https://user-images.githubusercontent.com/34605386/94805704-7d5c3d80-03f5-11eb-8d5e-5dd2da7f9881.jpg)
+
+For this addon to work you must be logged in to RetroAchievements in order for the caption to be generated.
+
+# Important
+
+This addon currently works for a custom build when my changes are merged to Kodi you will be able to use it.