add asset library template

Author: antoinecharruel

.asset-template.json.hb

@@ -0,0 +1,14 @@
+{
+  "title": "godot-cpp-template",
+  "category": "2D Tools",
+  "category_id": "1",
+  "godot_version": "4.1",
+  "version_string": "{{ context.inputs.tag_name }}",
+  "cost": "MIT",
+  "download_provider": "Custom",
+  "download_commit": "https://github.com/godotengine/godot-cpp-template/releases/download/{{ context.inputs.tag_name }}/godot-cpp-template.zip",
+  "browse_url": "{{ context.repository.html_url }}",
+  "issues_url": "{{ context.repository.html_url }}/issues",
+  "download_url": "https://github.com/godotengine/godot-cpp-template/releases/download/{{ context.inputs.tag_name }}/godot-cpp-template.zip",
+  "icon_url": "https://raw.githubusercontent.com/godotengine/godot-cpp-template/main/example.png"
+}