Add VERSIONING.md

Author: strombetta

VERSION

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+1.0.0

VERSIONING.md

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+# Versioning Policy
+
+BugleOS Cross Toolchain follows Semantic Versioning 2.0.0.
+
+## Version Format
+
+`MAJOR.MINOR.PATCH` stored in the `VERSION` file.
+
+- **MAJOR**: incompatible changes (build outputs, flags, toolchain layout)
+- **MINOR**: backward-compatible feature additions
+- **PATCH**: backward-compatible bug fixes and reproducibility fixes
+
+## Tags
+
+Release tags follow:
+
+`vMAJOR.MINOR.PATCH`  
+or  
+`vMAJOR.MINOR.PATCH-PRERELEASE`
+
+Examples:
+- `v1.2.3`
+- `v1.2.3-rc.1`
+
+## Release Process
+
+1. Update `VERSION` with the next `MAJOR.MINOR.PATCH`.
+2. Create an annotated tag using the `Tag from VERSION` workflow.
+3. CI builds artifacts, verifies checksums, and publishes the release.
+
+## Pre-releases
+
+Pre-releases are allowed (e.g., `-rc.1`, `-beta.1`) and are published as
+pre-release tags in GitHub.
+
+## Hotfixes
+
+Hotfixes increment **PATCH** and follow the same release process.