Note in README how to run a single test

Dependencies

• [2] TOTCBKRU README: update with instructions on running tests
• [*] NVMDS7GE Add README.md

Change contents

• edit in README.md at line 116
  [2.200]

  [2.200]
  + $ # Or, to run a single test, use:

  + $ yath test ./t/foo/bar.t