Update README.md

README.md

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 # gdx-xml
-LibGDX XML classes extracted into a standalone library
+LibGDX XML classes extracted into a standalone library (i.e. no OpenGL, LWJGL, etc. required)
+
+Mechanism
+----------------------
+
+The gradle build will checkout a specific version of libgdx, copy the compression source files into src/main/java, package renamed from _com.badlogic.gdx.utils_ to _org.mini2Dx.gdx.xml_ and compile the standalone jar.
+
+Usage
+----------------------
+
+```gradle
+compile "org.mini2Dx:gdx-xml:1.9.8"
+```
+
+This project's only dependency is [gdx-collections](https://github.com/mini2Dx/gdx-collections).
+
+Included Classes
+----------------------
+
+ * BufferUtils.java
+ * SerializationException.java
+ * StreamUtils
+ * XmlReader
+ * XmlWriter