README.rst: Making python-gstreamer required pkg more prominent
Introducing samples directory

The samples directory is supposed to contain example
tests that one can use as a test skeleton, so they can
get started by simply typing

cp samples/template.py tests/new_test.py

And start editing their new test.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
README.rst: Adding first new test docs

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>