add readme

README.md

+# Installation
+
+Add Maven repository
+
+    https://mvn.tickaroo.com
+
+to your project and
+
+    com.tickaroo:sdk:2.8.0
+
+to the dependencies of your app.
+
+# Javadoc
+
+    http://builds.tickaroo.net/pub/doc/embed/android/
+
+# Integration
+
+First you have to initialize `TickarooEmbedManager` by invoking the default constructor. This has to be done exactly once. For your `TickarooEmbedManager` you have to provide an implementation of `TickarooEmbedManagerDelegate`.
+
+# Styling
+
+The following four colours can be overridden in the resources:
+
+- tickaroo\_primary\_color
+- tickaroo\_primary\_color\_dark
+- tickaroo\_accent\_color
+- tickaroo\_accent\_color\_dark
+
+By default the primary colours are green and the accent colours are orange.
+
+The following four fonts can be changed to any standard android font family by overwriting the values in res/values-v16/strings.xml
+
+- font\_family\_medium
+- font\_family\_light
+- font\_family\_black
+- font\_family\_regular
+
+By default these are set to the corresponding sans-serif font families, normally Roboto. The comic font can be replaced by a custom font file in assets/fonts. The file name is specified by the string font\_file\_comic
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