Add AI skill

[perrygoy]

SKILL.mds appear to be The Way™ to tell agents how to do things. This is my first stab at creating a way for someone using ScreenPy to say, "hey Agent, code me up a test that tests this thing." I'm imagining we will create SKILL.md files for each of our packages and include them in the bundle somehow, then the instructions created by the agent (yes, i asked it to generate the .rst file because i wasn't sure how to do it) would work?

I also included a separate commit showing what the example test looks like. This is the prompt i used to create it:

can you use this skill to generate an example test suite (in ./example_test) which implements the following tests:

• Testing Logging:
  1. An Actor named Perry logs "This is a test!"
  2. The actor asserts that True is equal to True
• Testing Make Note:
  1. The actor makes note of the value "this is only a test"
  2. The actor asserts the value of the note contains the text "test"
• Testing See All Of:
  1. The actor sees if 1 is less than 2, [1, 2, 3] contains 3, and "blahdy blah" matches the regex pattern r".?y b.?

Use pytest to structure the tests

I did need to clarify to leverage the aliases to make the tests sound more English, but i asked it to add those directions to the SKILL.md file afterwards, so hopefully that won't be necessary for end users.