Document Connected Library manifest layout

templates/connected-modpack/README.md

@@ -0,0 +1,26 @@
+# Connected Modpack Template
+
+Use this layout for a modpack repository that should work with Modrinth Plus Connected Library.
+
+```text
+.
+|-- modrinth-plus.json
+|-- CHANGELOG.md
+|-- README.md
+`-- exports/
+    `-- YourPack-1.0.0.mrpack
+```
+
+Update `modrinth-plus.json` after every exported `.mrpack` release. The file must stay in the repository root.
+
+Connect with either the repository URL:
+
+```text
+https://git.example.com/owner/your-pack
+```
+
+or the raw manifest URL:
+
+```text
+https://git.example.com/owner/your-pack/raw/branch/main/modrinth-plus.json
+```