Add security file

Author: CodeDoctorDE

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported |     |
+| ------- | --------- | --- |
+| 0.1.0   | ⚠️         |     |
+
+Currently there is no version released yet.
+Because of that, there is also no main branch.
+Stay tuned for the first release!
+
+## Reporting a Vulnerability
+
+Please use [the bug tracker](https://github.com/LinwoodDev/Luna/issues) for reporting bugs. Please make sure you are on the latest stable or nightly release.
+
+Use [security@linwood.dev](mailto:security@linwood.dev) or [the github security advisory](https://github.com/LinwoodDev/Luna/security/advisories) if you want to report a security vulnerability.
+**Don't use the bug tracker for security vulnerabilities!**
+
+## Version scheme
+
+The version scheme is based on [Semantic Versioning](https://semver.org/spec/v2.0.0.html). All stable versions will be released in stable branch while all alpha, beta and release candidates will be released in the nightly branch.
+There will be alphas, betas and release candidates on every major release, betas and release candidates on every minor release and release candidates on every patch release.
+
+## Branches
+
+| Name    | Support |                                                                                                  Description | Tag     |
+| :------ | :-----: | -----------------------------------------------------------------------------------------------------------: | ------- |
+| main    |    ✅    |                   This branch is production ready. It will be updated when a new stable version is released! | Stable  |
+| develop |    ⚠️    | This branch is only for testing and developing. Pull request for feature requests should only be added here! | Nightly |
+
+Read more about nightly [here](https://luna.linwood.dev/community/nightly).