Create SECURITY.md (#7692)

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We always provide security updates for the [latest release](https://github.com/minio/minio/releases/latest).
+Whenever there is a security update you just need to upgrade to the latest version.
+
+## Reporting a Vulnerability
+
+All security bugs in [minio/minio](https://github,com/minio/minio) (or other minio/* repositories)
+should be reported by email to security@min.io. Your email will be acknowledged within 48 hours, 
+and you'll receive a more detailed response to your email within 72 hours indicating the next steps 
+in handling your report. 
+
+Please, provide a detailed explanation of the issue. In particular, outline the type of the security 
+issue (DoS, authentication bypass, information disclouse, ...) and the assumptions you're making (e.g. do 
+you need access credentials for a successful exploit).
+
+If you have not received a reply to your email within 48 hours or you have not heard from the security team
+for the past five days please contact the security team directly:
+   - Primary security coordinator: aead@min.io
+   - Secondary coordinator: harsha@min.io
+   - If you receive no response: dev@min.io
+
+### Disclosure Process
+
+MinIO uses the following disclosure process:
+
+1. Once the security report is received one member of the security team tries to verify and reproduce
+   the issue and determines the impact it has.
+2. A member of the security team will respond and either confrim or reject the security report.
+   If the report is rejected the repsonse explains why.
+3. Code is audited to find any potential similar problems.
+4. Fixes are prepared for the latest release. 
+5. On the date that the fixes are applied a security advisory will be published on https://blog.min.io.
+   Please inform us in your report email whether MinIO should mention your contribution w.r.t. fixing
+   the security issue. By default MinIO will **not** publish this information to protect your privacy.
+   
+This process can take some time, especially when coordination is required with maintainers of other projects.
+Every effort will be made to handle the bug in as timely a manner as possible, however it's important that we 
+follow the process described above to ensure that disclosures are handled consistently.