Adding devcontainer pinned to latest official image (#44042)

Author: Cam Soper

.devcontainer/devcontainer.json

@@ -0,0 +1,21 @@
+{
+	"name": "C# (.NET)",
+	"image": "mcr.microsoft.com/devcontainers/dotnet:latest"
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [5000, 5001],
+	// "portsAttributes": {
+	//		"5001": {
+	//			"protocol": "https"
+	//		}
+	// }
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "dotnet restore",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+}