Create SECURITY.md

Signed-off-by: Marek Kaput <[email protected]>

Author: mkaput

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+<!-- Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 5.1.x   | :white_check_mark: |
+| 5.0.x   | :x:                |
+| 4.0.x   | :white_check_mark: |
+| < 4.0   | :x:                |
+-->
+
+Only the latest release is supported with security updates.
+
+## Reporting a Vulnerability
+
+If there are any vulnerabilities in **Scarb**, don't hesitate to _report them_.
+
+1. If you found a vulnerability in **Cairo** language/compiler,
+   please consult its own [security policy](https://github.com/starkware-libs/cairo/security/policy).
+2. Use GitHub Security site for reporting vulnerabilities.
+   You can report one [here](https://github.com/software-mansion/scarb/security/advisories/new).
+3. Please **do not disclose the vulnerability publicly** until a fix is released!
+4. Once we have either a) published a fix, or b) declined to address the vulnerability for whatever reason,
+   you are free to publicly disclose it.