chore: Add GitHub Copilot extension to devcontainer.json

.devcontainer/devcontainer.json

@@ -1,9 +1,24 @@
 {
   // Name this configuration
   "name": "Codespace for Skills!",
+
   // Use the base codespace image
   "image": "mcr.microsoft.com/vscode/devcontainers/universal:latest",
 
   "remoteUser": "codespace",
-  "overrideCommand": false
+  "overrideCommand": false,
+
+  // Add the IDs of extensions you want installed when the container is created.
+  "customizations": {
+      "vscode": {
+          "extensions": [
+              "GitHub.copilot"
+          ]
+      },
+      "codespaces": {
+          "openFiles": [
+              "codespace.md"
+          ]
+      }
+  }
 }