adding CTFd information

Adding information about open source CTF platform CTFd
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Omar Santos 2018-07-17 21:28:18 -04:00 committed by GitHub
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@ -10,5 +10,6 @@ Capture the flag (CTF) is a computer security competition that is designed for e
* http://captf.com
* https://pentesterlab.com/exercises
* http://vulnhub.com
* https://challenges.re/
* http://cryptopals.com/
* https://challenges.re
* http://cryptopals.com
* https://github.com/CTFd/CTFd