init CTFd source

.github/ISSUE_TEMPLATE.md

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+<!--
+If this is a bug report please fill out the template below.
+
+If this is a feature request please describe the behavior that you'd like to see.
+-->
+
+**Environment**:
+
+- CTFd Version/Commit:
+- Operating System:
+- Web Browser and Version:
+
+**What happened?**
+
+**What did you expect to happen?**
+
+**How to reproduce your issue**
+
+**Any associated stack traces or error logs**