Add file SECURITY.md (#221)

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* Add default SECURITY.md file

Author: kparkinson-ld

SECURITY.md

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+#Reporting and Fixing Security Issues
+
+Please report all security issues to the LaunchDarkly security team by submitting a bug bounty report to our [HackerOne program](https://hackerone.com/launchdarkly?type=team). LaunchDarkly will triage and address all valid security issues following the response targets defined in our program policy. Valid security issues may be eligible for a bounty.
+
+Please do not open issues or pull requests for security issues. This makes the problem immediately visible to everyone, including potentially malicious actors.