chore(cli): add deprecation notice for electron (#3263)

cli/src/tasks/add.ts

@@ -5,7 +5,7 @@ import { addElectron } from '../electron/add';
 import { addIOS, addIOSChecks } from '../ios/add';
 import { editProjectSettingsAndroid } from '../android/common';
 import { editProjectSettingsIOS } from '../ios/common';
-import { check, checkAppConfig, checkPackage, checkWebDir, hasYarn, log, logError, logFatal, logInfo, resolvePlatform, runCommand, runPlatformHook, runTask, writePrettyJSON } from '../common';
+import { check, checkAppConfig, checkPackage, checkWebDir, hasYarn, log, logError, logFatal, logInfo, logWarn, resolvePlatform, runCommand, runPlatformHook, runTask, writePrettyJSON } from '../common';
 import { sync } from './sync';
 
 import chalk from 'chalk';
@@ -29,6 +29,8 @@ export async function addCommand(config: Config, selectedPlatformName: string) {
     if (platformName === config.web.name) {
       webWarning();
       return;
+    } else if (platformName === config.electron.name) {
+      electronWarning();
     }
 
     const existingPlatformDir = config.platformDirExists(platformName);
@@ -132,3 +134,8 @@ function webWarning() {
   log(`For example, if you have a React or Angular project, the 'web' platform is that project.`);
   log(`To add Capacitor functionality to your web app, follow the Web Getting Started Guide: https://capacitorjs.com/docs/web`);
 }
+
+function electronWarning() {
+  logWarn(`The electron platform is deprecated!`);
+  log(`\nPlease use the Capacitor Community Electron Platform: https://github.com/capacitor-community/electron\n`);
+}