api tests: allow to run and debug them

extensions/vscode-api-tests/.vscode/launch.json

@@ -0,0 +1,17 @@
+// A launch configuration that compiles the extension and then opens it inside a new window
+{
+	"version": "0.1.0",
+	"configurations": [
+		{
+			"name": "Launch Tests",
+			"type": "extensionHost",
+			"request": "launch",
+			"runtimeExecutable": "${execPath}",
+			"args": ["${workspaceRoot}/../../", "${workspaceRoot}/testWorkspace", "--extensionDevelopmentPath=${workspaceRoot}", "--extensionTestsPath=${workspaceRoot}/out" ],
+			"stopOnEntry": false,
+			"sourceMaps": true,
+			"outDir": "out",
+			"preLaunchTask": "npm"
+		}
+	]
+}