Add fullstack example

examples/fullstack/.devcontainer/devcontainer.json

@@ -0,0 +1,25 @@
+{
+  "name": "Fullstack DevContainer",
+  "dockerComposeFile": ["../docker-compose.yml"],
+  "service": "frontend",
+  "workspaceFolder": "/app",
+  "shutdownAction": "stopCompose",
+  "forwardPorts": [80, 8080],
+  "settings": {
+    "terminal.integrated.defaultProfile.linux": "bash"
+  },
+"mounts": [
+  "source=frontend_node_modules,target=/app/node_modules,type=volume",
+  "source=backend_node_modules,target=/backend/node_modules,type=volume",
+  "source=${localWorkspaceFolder}/backend,target=/backend,type=bind"
+],
+"postCreateCommand": "npm install && cd /backend && npm install",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "dbaeumer.vscode-eslint",
+        "esbenp.prettier-vscode"
+      ]
+    }
+  }
+}