#187 modify readme page

Author: lberti

contribute/modules/girder/pages/README.adoc

@@ -1 +1,13 @@
-include::data:ROOT:partial$girder/README.adoc[]
+= Girder
+
+== What is Girder
+
+Girder is a data management platform.
+It can be used to store (large) files such as meshes, simulation results, etc...
+Read more about it in the {feelpp} xref:data:ROOT:data-storage.adoc[data manual] or
+link:http://girder.readthedocs.io/[on the official website].
+
+include::data:ROOT:partial$girder/README.adoc[]
+
+Let's check out some
+xref:contribute:girder:python_scripts.adoc[scripts].