docs: add SECURITY.md

Author: Mcdostone

SECURITY.md

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+# Security
+
+If you believe you have found a security vulnerability in the nom-kconfig repository, please report it to me as described below.
+
+## Reporting security issues
+
+⚠️ Please do not report security vulnerabilities through public GitHub issues. ⚠️
+**Instead, please kindly email me at yann.prono@telecomnancy.net**
+
+Please include the requested information listed below (as much as you can provide) to help us better understand the nature and scope of the possible issue:
+
+- 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
+
+
+## Preferred languages
+
+We prefer all communications to be in English or French.