Added an initial SECURITY.md file (#132)

Added a SECURITY.md file with content based on the relevant
Modular web page.

Author: aahrun

SECURITY.md

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+At Modular, we care deeply about safety, privacy, and security. We appreciate your interest and assistance.
+
+# Reporting Security Issues
+
+If you have discovered a potential issue related to safety, privacy, or security in this project we would encourage you to report these to us privately before disclosing them on public forums, issues, or pull requests. We truly appreciate your initiative to help improve our security.
+
+Please collect the following information related to your issue:
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+- A summary of the observed and expected behaviors
+- Steps to reproduce
+- Details of the environment you are using
+
+Once you have these details please visit https://www.modular.com/company/report-issue and submit the security issue. At this time we cannot provide a personal response to each report.