Added .vscode/launch.json (#534)

Author: Josh Goldberg

.vscode/launch.json

@@ -0,0 +1,18 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Jest: Current File",
+            "program": "${workspaceFolder}/node_modules/.bin/jest",
+            "args": ["--runTestsByPath", "${relativeFile}"],
+            "console": "integratedTerminal",
+            "internalConsoleOptions": "neverOpen",
+            "disableOptimisticBPs": true,
+            "windows": {
+                "program": "${workspaceFolder}/node_modules/jest/bin/jest"
+            }
+        }
+    ]
+}