Update where_to_put_tests.rst

Added links for relevant links for nose and unittest

Author: kgashok

Sources/source/where_to_put_tests.rst

@@ -18,7 +18,9 @@ Test system recommendations
 
 https://docs.pytest.org/en/stable/goodpractices.html
 
-I need to add links for ``nose`` and ``unittest`` ... PR's accepted!
+For ``nose``, read https://nose.readthedocs.io/en/latest/finding_tests.html
+
+and for ``unittest`` read https://docs.python.org/3/library/unittest.html#test-discovery .
 
 
 Two Options