Create SECURITY.md

SECURITY.md

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+# Security Policy
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+## Reporting a Vulnerability
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+If you have apprehensions regarding Apollo's security or you discover vulnerability or potential threat, don’t hesitate to report it to one of the active [project maintainers](https://github.com/ctripcorp/apollo/graphs/contributors). 
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+In the mail, specify the description of the issue or potential threat. You are also urged to recommend the way to reproduce and replicate the issue. The Apollo community will get back to you after assessing and analysing the findings.
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+PLEASE PAY ATTENTION to report the security issue on the security email before disclosing it on public domain.