feat: add electron app.

electron/app/main.js

@@ -0,0 +1,15 @@
+const path = require('path');
+const { App } = require('@wcj/wxmp-main');
+
+(async () => {
+  const options = {};
+  if (process.env.NODE_ENV === 'development') {
+    options.preload = require.resolve('@wcj/wxmp-preload');
+    options.webpath = require.resolve('website/build/index.html');
+  } else {
+    options.preload = path.resolve(__dirname, 'website/index.js');
+    options.webpath = 'website/index.html';
+  }
+  const app = new App();
+  await app.createWindow(options);
+})();