Server example

[AlexeyDer]

Add server example that serves badges

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[AlexeyDer]

@googlebot I signed it!

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[brianquinlan]

Thanks very much for your contribution!

If you make the fixes that I suggested then I'd be happy to merge.

But this would be even better if:

1. you created a requirements.txt (https://pip.pypa.io/en/stable/user_guide/#requirements-files)
2. you created a README.md in this directory explaining how to run the server and access the resulting image.

[brianquinlan]

Thank you very much, feel free to merge!

If you wanted, you could file an issue to add tests to this example and then write them ;-)