Add Google Apps Script version

Google Apps Script version/README.md

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+# Tangmo FxTwitter Bot (Google Apps Script version)
+
+Telegram bot that monitor for a message with just Twitter link without preview and reply with [FxTwitter](https://github.com/FixTweet/FixTweet) link
+
+1. Register Telegram bot
+1. Setup Google Apps Script
+    1. Create a Google Sheets
+    1. Click Extensions > Apps Script.
+    1. Paste the code from this repo, click "Save"
+    1. Go to Project Settings tab
+    1. Scroll to the bottom, "Script Properties", and add a `TELEGRAM_BOT_TOKEN` property
+    1. At the top right of the script project, click Deploy > New deployment > Web app. Run as me, anyone can access
+    1. Copy the webapp URL. It should look like https://script.google.com/macros/s/some-long-id/exec
+1. Register Web hook
+    ```sh
+    curl --request POST \
+    --url https://api.telegram.org/bot123:bottokenhere/setWebhook \
+    --header 'Content-Type: application/json' \
+    --data '{"url": "https://script.google.com/macros/s/some-long-id/exec"}'
+    ```
+1. It should work now

Google Apps Script version/TangMo_fxtwitter_bot.gs

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+function doPost(e) {
+  const contents = JSON.parse(e.postData.contents);
+  if (contents.message?.media_group_id || !contents.message?.text) {
+    return;
+  }
+
+  const found = contents.message.text.match(/https?:\/\/(?:mobile\.)?twitter\.com\/(\w+)\/status\/(\d+)(\/photo\/\d)?/);
+  if (found) {
+    // Feel free to hardcode bot token, reducing PropertiesService usage quota
+    UrlFetchApp.fetch(`https://api.telegram.org/bot${PropertiesService.getScriptProperties().getProperty('TELEGRAM_BOT_TOKEN')}/`, {
+      method: "post",
+      payload: {
+        method: "sendMessage",
+        chat_id: String(contents.message.chat.id),
+        text: `https://fxtwitter.com/${found[1]}/status/${found[2]}${found[3] || ''}`,
+        reply_to_message_id: String(contents.message.message_id),
+        disable_notification: true,
+      }
+    });
+  }
+}
+
+function doGet() {
+  return HtmlService.createHtmlOutput('Webhook Endpoint for <a href="https://t.me/TangMo_fxtwitter_bot">@TangMo_fxtwitter_bot</a> Telegram bot');
+}