chore(test): add external test fixtures

test/fixture/README.md

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+# Test Fixtures
+
+Some of Whoa's tests require certain assets for the tests to work properly. Since these assets are
+not appropriate for redistribution, they must be manually placed here. CI runs in Whoa's source
+control platform involve a step that copies these assets into the `fixture` directory without
+directly exposing the assets.
+
+Expected fixtures are:
+
+* `font/FRIZQT__.TTF`: The primary UI font used in the game