Create README.md

Author: smowton

README.md

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+# codeql-ctf-go-return
+Extension project for the Go and Don't Return CodeQL CTF
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+This repository is intended for use by contestants in the March 2021 CodeQL CTF. If you are unfamiliar, first read the [todo-insert-url](contest documentation).
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+This is a set of example programs that exhibit coding mistakes similar to CVE-2020-11012 found in MinIO, but which are in various ways trickier to accurately detect than the original MinIO bug. See the contest documentation linked above for instructions on building a CodeQL database for these examples and identifying bugs in them.
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+If you notice any errors or omissions that don't appear related to the intentional bugs that are the target of the contest, see CONTRIBUTING.md for instructions on submitting pull requests.
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+These examples are licensed under CC0. See the LICENSE file for full details.