Add VanillaBeyond connected library export

.gitignore

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+Thumbs.db
+.DS_Store

CHANGELOG.md

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+# Changelog
+
+## 21.228.3
+
+- Initial exported Modrinth App modpack for Connected Library testing.

README.md

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+# VanillaBeyond Connected Library Test
+
+Test repository for the Modrinth App "Connected Library" feature.
+
+Use this repository URL in the Modrinth App:
+
+```text
+https://git.wilkensxl.de/MrSphay/VanillaBeyond-connected-library-test
+```
+
+If that does not work, try the `.git` clone URL:
+
+```text
+https://git.wilkensxl.de/MrSphay/VanillaBeyond-connected-library-test.git
+```
+
+## Included Export
+
+```text
+exports/VanillaBeyond-21.228.3.mrpack
+```
+
+Pack metadata from the export:
+
+- Name: `VanillaBeyond Visual`
+- Version: `21.228.3`
+- Minecraft: `1.21.1`
+- Loader: `neoforge 21.1.228`
+
+## Update Workflow
+
+1. Export a new `.mrpack` from the Modrinth App.
+2. Put it into `exports/`.
+3. Use a versioned filename, for example `VanillaBeyond-21.228.4.mrpack`.
+4. Commit and push the change.
+5. Click `Check for updates` in the Modrinth App Connected Library.
+
+Keep the repository public, otherwise the Modrinth App cannot read it without authentication.