Let projects add repos without prior-approval

Some OpenStack projects are adding git repos at a moderate pace
and generally the TC is rubber-stamping them as long as the PTL
approves.  Explicitly codify that this is desirable -- the TC
doesn't really care how many git repos it takes to accomplish a
task, so as long as a new repo fits within the existing mission
statement, indicate that it is permissible to add it without
prior TC approval.

This is not strictly a "new project requirement", however, this
document seems to be the best existing place to add it as it
relates to project creation.

Change-Id: I34acfe4ffe5a0af6a941e70a5315a07d036e6c24

reference/new-projects-requirements.rst

@@ -52,3 +52,9 @@ When considering new projects for addition, the TC will check that:
   authentication.
 
 * The project should have an active team of contributors
+
+* Once a project has joined OpenStack, it may create additional source
+  code repositories as needed at the discretion of its Project
+  Technical Lead (PTL) without prior approval from the TC as long as
+  the additional source code repositories fall within the scope of the
+  approved project mission statement.