test: initial commit adding hypothesis property testing library
Adding the Hypothesis cache dir to .gitignore
Grammar fixes in geometry.py
Hypothesis dep in pyproject.toml without version peg
Initial strategies in conftest.py. This is the only file name I could use that didn't cause an issue with the name-tests-test pre-commit hook. 'strategies.py' would be better because strictly speaking these aren't fixtures.
An example test for encode/decode invariance.
