added github preamble

Author: jruaux

README.adoc

@@ -1,4 +1,14 @@
 = Spring RediSearch
+ifdef::env-github[]
+:badges:
+:tag: master
+:!toc-title:
+:tip-caption: :bulb:
+:note-caption: :paperclip:
+:important-caption: :heavy_exclamation_mark:
+:caution-caption: :fire:
+:warning-caption: :warning:
+endif::[]
 
 // Badges
 ifdef::badges[]