Add launch.json to run tests in VSCode debugger (#358)

Author: eps1lon

.vscode/launch.json

@@ -0,0 +1,21 @@
+{
+	// Use IntelliSense to learn about possible attributes.
+	// Hover to view descriptions of existing attributes.
+	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"type": "node",
+			"request": "launch",
+			"name": "Jest debug current test file",
+			"skipFiles": ["<node_internals>/**"],
+			"program": "${workspaceFolder}/node_modules/.bin/jest",
+			"args": ["${fileBasenameNoExtension}", "--watch"],
+			"console": "integratedTerminal",
+			"disableOptimisticBPs": true,
+			"windows": {
+				"program": "${workspaceFolder}/node_modules/jest/bin/jest"
+			}
+		}
+	]
+}