Document how to add groups in dist-git

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

creating_groups_distgit.md

@@ -0,0 +1,32 @@
+# How to create a group in dist-git?
+
+/!\ You may want to read first groups_in_fedora.md for information on the
+different types of groups in Fedora.
+
+Dist-git does not allow anyone to create groups, only admins can do it via the
+``pagure-admin`` CLI tool.
+
+To create a group, you can simply run the command:
+
+::
+
+    pagure-admin new-group <group_name> <username of requester> \
+         --description="short description" \
+        --display="Name used in the UI"
+
+The group members are then sync upon their login in dist-git (ie: people will
+have to log out and back in for their group membership to be refreshed).
+
+Groups are linked to the user who created it and it used to not be possible to
+give the group to another user(\*), so lots of the early groups were created to
+the ``releng`` user, thus allowing to easily remove the user who asked for the
+group if they left the project.
+
+It is nowadays possible to give groups from an user to another. This can be done
+by the person who is the current main admin of the group or a pagure admin.
+
+The URL to give a group is:
+
+::
+
+    https://src.fedoraproject.org/group/<group name>/edit