Refactor framework -- point to a tests/* directory for the user supplied tests

README.md

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+# A Mongoose OS I2C Mock
+
+Files in this repository are a Linux I2C implementation of the Mongoose OS
+I2C interface.
+
+## Howto
+
+Register tests in `tests/*.[ch]` and they will be compiled in. Each test must
+have functions uniquely named:
+```
+bool test_*_create();
+bool test_*_run();
+bool test_*_destroy();
+```
+
+And static variables named:
+```
+uint32_t test_*_period_ms; 
+```
+
+Running `make` will then generate the test skeleton, recursively compile
+all sources found in `src/`, `tests/`, and `libs/`, and for each, call the
+`create()` function, then the `run()` function each `period_ms` milliseconds,
+and upon exiting, call each `destroy()` function and clean up.