Add cosmetic changes to README title

Also add link to XRootD page: http://xrootd.org/

Author: matthewfeickert

README.md

@@ -1,2 +1,3 @@
-# getting-data-xroot
-Using the xroot protocol to access very large datasets
+# Getting Data with XRootD
+
+Use the [XRoot protocol](http://xrootd.org/) to access very large datasets