Add initial Codespaces settings file

.devcontainer/devcontainer.json

@@ -0,0 +1,28 @@
+{
+	"name": "Node.js",
+	"image": "mcr.microsoft.com/devcontainers/javascript-node:16-bullseye",
+
+	// Features to add to the dev container. More info: https://containers.dev/implementors/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "npm install",
+
+	// Configure tool-specific properties.
+	"customizations": {
+		"vscode": {
+			"settings": {
+				"extensions.ignoreRecommendations": true
+			},
+			"extensions": [
+				"NomicFoundation.hardhat-solidity"
+			]
+		}
+	},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}