docs: add main-and-renderer-process doc

docs/main-and-renderer-process.md

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+# Main vs Renderer Process
+
+A **Vutron** application is divided into code into a Main process and a Renderer process.
+
+**"Main"** is the code of `src/main` and is mainly the process code handled by Electron. **"Renderer"** is the code of `src/renderer`, mainly for front-end rendering process like Vue.
+
+The script code of Main cannot be referenced in the Renderer or vice versa, and the two processes can communicate using `IPC`.
+
+Please see the article below for more details: https://www.electronjs.org/docs/latest/tutorial/ipc