Adds Dev Container configuration

with VS Code extensions and port forwarding

.devcontainer/devcontainer.json

@@ -0,0 +1,27 @@
+{
+    "name": "Mario Kart Dev Container",
+    "image": "mcr.microsoft.com/devcontainers/javascript-node",
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "eamodio.gitlens",
+                "esbenp.prettier-vscode",
+                "VisualStudioExptTeam.vscodeintellicode",
+                "dbaeumer.vscode-eslint",
+                "dsznajder.es7-react-js-snippets",
+                "antfu.vite",
+                "meganrogge.template-string-converter",
+                "ambar.bundle-size",
+                "aaron-bond.better-comments"
+            ]
+        }
+    },
+    "forwardPorts": [4000],
+    "portsAttributes": {
+        "4000": {
+            "label": "Application",
+            "onAutoForward": "notify"
+        }
+    },
+    "postCreateCommand": "npm install"
+}