Added readme.txt and user default view

Added a readme.txt file
Overrided the views/default/user/default view for showing admin defined
metadata as brief description.
Updates footer module Navigation

Adds Download Elgg link and replace hardcoded language strings.

Referencing #31
Changes back wording
Merge pull request #34 from PerJensen/footer_module_navigation

Updates footer module Navigation
Merge pull request #27 from teamwebgalli/master

Added readme.txt and Overrided user default view