Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.0.0   | :white_check_mark: |
+| < 1.0   | :x:                |
+
+## Reporting a Vulnerability
+
+If you discover any security vulnerabilities in the Basic Calculator app, please report them to our security team by emailing security@basiccalculator.com. We take security issues seriously and will respond to verified reports promptly.
+
+When reporting a vulnerability, please include the following details:
+
+- A description of the vulnerability and the potential impact
+- Steps to reproduce the vulnerability
+- Any additional information that may be helpful in understanding and addressing the issue
+
+Our security team will acknowledge your report within 48 hours and provide an expected timeline for addressing the vulnerability. We appreciate your responsible disclosure and will keep you informed of any progress or decisions made regarding the vulnerability.
+
+Please note that we kindly request you not to publicly disclose any potential vulnerabilities until we have had an opportunity to investigate and address them. We believe in responsible disclosure and will work with you to ensure a timely and appropriate resolution.
+
+Thank you for helping us maintain the security of the Basic Calculator app!
+