Add Python demo to README

Author: thejohnfreeman

README.md

@@ -1,9 +1,10 @@
 # Xpring-SDK-Demo
 
 Demos for each library in [Xpring SDK](http://github.com/xpring-sdk):
-- [JavaScript / Xpring-JS](http://github.com/xpring-eng/xpring-js): `node/` 
-- [Java / Xpring4J](http://github.com/xpring-eng/xpring4j): `java/`
-- [Swift / XpringKit](http://github.com/xpring-eng/xpringkit): `swift/`
+- JavaScript / [Xpring-JS](http://github.com/xpring-eng/xpring-js): [`node/`](./node)
+- Java / [Xpring4J](http://github.com/xpring-eng/xpring4j): [`java/`](/.java)
+- Swift / [XpringKit](http://github.com/xpring-eng/xpringkit): [`swift/`](./swift)
+- Python / [xpring-py](https://github.com/thejohnfreeman/xpring-py): [`python/`](./python)
 
 Build instructions included in each folder.