Changed FIWARE docs to fix a compatibility issue

Author: csvurt

doc/README.md

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+Folder: doc/
+========
+
+This folder provides documentation in the FIWARE Generic Enabler context.
+
+* Please find the catalogue entry for the FIWARE 3D-UI-XML3D Generic Enabler here: [3D-UI-XML3D Catalogue Entry](http://catalogue.fiware.org/enablers/3d-ui-xml3d)
+
+* Information about how to setup and configure the enabler is provided in the Installation and Administration Guide: [Installation Guide](installation_guide.md)
+
+* Information of how to use the Generic Enabler and how to create applications using XML3D can be found in the User and Programmer Guide: [User Guide](user_guide.md)