Settings: Set schema for devcontainer-feature.json.

Author: CodeMan99

.devcontainer.json

@@ -2,6 +2,14 @@
     "image": "mcr.microsoft.com/devcontainers/javascript-node:0-18",
     "customizations": {
         "vscode": {
+            "settings": {
+                "json.schemas": [
+                    {
+                        "fileMatch": ["**/devcontainer-feature.json"],
+                        "url": "https://raw.githubusercontent.com/devcontainers/spec/main/schemas/devContainerFeature.schema.json"
+                    }
+                ]
+            },
             "extensions": [
                 "cschleiden.vscode-github-actions",
                 "EditorConfig.EditorConfig",