Merge branch '6-adding-an-contributing-section-to-the-manual' into 'master'

Resolve "adding an contributing section to the manual"

Closes #6

See merge request !10

source/contribute/guidelines.rst

+Guidelines for better contributions
+===================================
+
+There is a complete set of guidelines that you should read
+
+`Contributing to FusionDirectory <https://gitlab.fusiondirectory.org/fusiondirectory/fd/blob/1.3-dev/CONTRIBUTING.md>`_
+
+

source/contribute/index.rst

+Contributing to FusionDirectory
+===============================
+
+How to contribute to FusionDirectory
+
+.. toctree::
+   :maxdepth: 2
+
+   register
+   guidelines
+

source/contribute/register.rst

+Registering a FusionDirectory Account
+=====================================
+
+To create a FusionDirectory project Account you must go to
+`FusionDirectory Sign UP <https://register.fusiondirectory.org>`_

source/index.rst

@@ -16,6 +16,7 @@ Contents:
 .. toctree::
    :maxdepth: 2
 
+   contribute/index
    coding/index
    pluginsystem/index
    api/index