Adds sandbox launch config

Author: eamodio

.vscode/launch.json

@@ -17,6 +17,21 @@
             "smartStep": true,
             "sourceMaps": true
         },
+        {
+            "name": "Launch GitLens (Sandbox)",
+            "type": "extensionHost",
+            "request": "launch",
+            "runtimeExecutable": "${execPath}",
+            "args": ["--disable-extensions", "--extensionDevelopmentPath=${workspaceFolder}"],
+            "env": {
+                "VSCODE_DEBUGGING_EXTENSION": "gitlens"
+            },
+            "cwd": "${workspaceFolder}",
+            "outFiles": ["${workspaceFolder}/dist/**/*.js"],
+            "skipFiles": ["<node_internals>/**", "**/resources/app/out/vs/**"],
+            "smartStep": true,
+            "sourceMaps": true
+        },
         {
             "name": "Watch & Launch GitLens",
             "type": "extensionHost",