Add picoCTF parser

[peace-maker]

This parses the challenges of the https://play.picoctf.org/ platform.

You have to paste the json of the /api/challenges/?page_size=500&page=1&event=XX endpoint manually where XX is the ID of the running event.

[JJ-8]

Thank you very much for your contribution! I have pushed only one small beautification suggested by VSCode. The code looks great and I have tested it successfully with the following data:

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