DOC: Add SECURITY.md

See equinor#926.

SECURITY.md

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+If you discover a security vulnerability in this project, please follow these steps to responsibly disclose it:
+
+1. **Do not** create a public GitHub issue for the vulnerability.
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+2. Follow our guideline for Responsible Disclosure Policy at https://www.equinor.com/about-us/csirt to report the issue
+
+
+The following information will help us triage your report more quickly:
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+- Type of issue (e.g. buffer overflow, SQL injection, cross-site scripting, etc.)
+- Full paths of source file(s) related to the manifestation of the issue
+- The location of the affected source code (tag/branch/commit or direct URL)
+- Any special configuration required to reproduce the issue
+- Step-by-step instructions to reproduce the issue
+- Proof-of-concept or exploit code (if possible)
+- Impact of the issue, including how an attacker might exploit the issue
+- We prefer all communications to be in English.