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