Split up debugging-main-process.md, add electron-inspector guide

- Move the debugging guides for VSCode and node-inspector into separate
  files.
- Add instructions for using electron-inspector to the node-inspector
  guide.
- Remove note in node-inspector guide about crashing when inspecting
  `process` (it was fixed a long time ago:
  https://github.com/nodejs/node-v0.x-archive/issues/8205)

docs/tutorial/debugging-main-process-vscode.md

@@ -0,0 +1,34 @@
+# Debugging the Main Process in VSCode
+
+### 1. Open an Electron project in VSCode.
+
+```bash
+$ git clone git@github.com:electron/electron-quick-start.git
+$ code electron-quick-start
+```
+
+### 2. Add a file `.vscode/launch.json` with the following configuration:
+
+```json
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Debug Main Process",
+      "type": "node",
+      "request": "launch",
+      "cwd": "${workspaceRoot}",
+      "runtimeExecutable": "${workspaceRoot}/node_modules/.bin/electron",
+      "program": "${workspaceRoot}/main.js"
+    }
+  ]
+}
+```
+
+**Note:** For Windows, use `"${workspaceRoot}/node_modules/.bin/electron.cmd"` for `runtimeExecutable`.
+
+### 3. Debugging
+
+Set some breakpoints in `main.js`, and start debugging in the [Debug View](https://code.visualstudio.com/docs/editor/debugging). You should be able to hit the breakpoints.
+
+Here is a pre-configured project that you can download and directly debug in VSCode: https://github.com/octref/vscode-electron-debug/tree/master/electron-quick-start