chore(vscode): add shared vscode settings

.vscode/extensions.json

@@ -0,0 +1,9 @@
+{
+	// See https://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+	// Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+	// List of extensions which should be recommended for users of this workspace.
+	"recommendations": [
+		// Allows for use of settings.shared.json and settings.local.json.
+		"swellaby.workspace-config-plus"
+	]
+}