Add debug configuration for VS Code

.vscode/launch.json

@@ -0,0 +1,28 @@
+{
+    // 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": "Debug via NPM",
+            "runtimeExecutable": "npm",
+            "runtimeArgs": [
+                "run-script",
+                "debug"
+            ],
+            "env": {
+                "WEBHOOK_SECRET": "fa7689e3"
+            },
+            "port": 9229
+        },
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Launch Program",
+            "program": "${workspaceFolder}/index.js"
+        }
+    ]
+}

package.json

@@ -5,6 +5,7 @@
   "main": "index.js",
   "scripts": {
     "start": "node index.js",
+    "debug": "node --inspect-brk index.js",
     "test": "./node_modules/mocha/bin/mocha"
   },
   "author": "",