Create script to zip up picamera tests and hashes of releavant source files

hardware-specific-tests/README.md

@@ -0,0 +1,23 @@
+## Hardware specific tests for the PiCamera.
+
+These are very slow as they run on hardware. They can be run with:
+
+    pytest hardware-specific-tests
+
+It is essential to stop the server first:
+
+    ofm stop
+
+However, this will not archive the tests in the Git repository for reporting the coverage. For this see the section below on reporting the coverage.
+
+When writing and debugging these unit tests it is often best to run a specific test and to use the `-s` flag to see the print statments. It is also often useful to use `--pdb` to drop you into a python debug session on any failure. For example, you might run:
+
+    /picamera2/test_exposure_time_drift.py::test_exposure_time_saves_and_loads -s --pdb
+
+### Reporting the coverage
+
+To create a coverage report that will be included into the repository run:
+
+    ./picamera_tests.py run
+
+This will create a zip of test results along with hashes of the picamera files and the base camera file. The server will include this overage report if the source files remain the same.