Create SECURITY.md

Signed-off-by: Christopher Jr Riley <chrisjr@cjrriley.com>

Author: MasterJ93

SECURITY.md

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+# Security Policy
+
+## Version Support
+Currently, the latest version of the repository supports security vulnerability reports. For example, if the latest version of `ATOAuthKit` is 0.19.4, then only version 0.19.4 can be reported, as the security issues prior to that may have already been resolved.
+
+## Reporting a Vulnerability
+
+Please don’t report possible security vulnerabilities in public forums, channels, or services. This includes the Issues section on GitHub, Discord, or some other service. Instead, please go to Security > Advisories and click on [New Draft Security Advisory]([https://github.com/ATProtoKit/ATOAuthKit/security/advisories/new](https://github.com/ATProtoKit/.github/security/advisories/new)). Alternatively, you can email me at [security@cjrriley.com](mailto:security@cjrriley.com?subject=%5Brepository%5D%20Security%20Vulnerability:%20[ENTER%20TITLE%20HERE])
+ with the subject line `ATOAuthKit Security Issue: [title of vulnerability]`. Please type out what you found, how to reproduce the steps, a possible link to a sample project that can reproduce the error, and any other additional information that could help me fix the problem.
+
+I will get back to you within three business days, along with a follow-up when I fix the vulnerabilities. Once I fixed it, you’re free to discuss it.
+
+If you’d like for me to add you to the CONTRIBUTORS file, please give me the following details:
+- Your name; whether it’s:
+    - First and last name (optional)
+    - Your username on some Git service (GitHub, GitLab, Bitbucket) (optional)
+    - An alias (required if you don’t want to use the above options)
+- Email address (optional)
+- Social media (up to three; Bluesky link encouraged!)
+- Website (optional)