Created Tests (markdown)

Tests.md

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+There are tests that just verify that basic image creation works vi API.
+
+To run tests, add `--tests` as a commandline argument to `launch.py` along with your other command line arguments:
+
+```
+python launch.py --skip-torch-cuda-test --deepdanbooru --no-half-vae --tests
+```
+
+You'll find outputs of main program in `test/stdout.txt` and `test/stderr.txt`.