Added Flask Google Cloud bot's example

Author: xinitd

examples/serverless/flask_google_cloud_bot/.gcloudignore

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+env/

examples/serverless/flask_google_cloud_bot/app.yaml

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+runtime: python38
+
+env_variables:
+  BUCKET_NAME: "your-google-application"

examples/serverless/flask_google_cloud_bot/main.py

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+'''
+Simple bot for Google cloud deployment.
+
+Docs:
+https://cloud.google.com/run/docs/quickstarts/build-and-deploy/deploy-python-service
+
+1. Receive your bot's token from https://t.me/BotFather
+
+2. Create a Google Cloud project. https://cloud.google.com/resource-manager/docs/creating-managing-projects
+
+3. Install the Google Cloud CLI. https://cloud.google.com/sdk/docs/install
+
+4. Move to telegram_google_cloud_bot folder
+
+cd telegram_google_cloud_bot/
+
+5. Initialize the gcloud CLI:
+
+gcloud init
+
+6. To set the default project for your Cloud Run service:
+
+gcloud config set project PROJECT_ID
+
+7. Deploy:
+
+gcloud run deploy
+'''
+
+import os
+
+from flask import Flask, request
+
+import telebot
+
+TOKEN = 'token_from_botfather'
+
+bot = telebot.TeleBot(TOKEN)
+
+app = Flask(__name__)
+
+
+@bot.message_handler(commands=['start'])
+def start(message):
+    bot.reply_to(message, 'Hello, ' + message.from_user.first_name)
+
+
+@bot.message_handler(func=lambda message: True, content_types=['text'])
+def echo_message(message):
+    bot.reply_to(message, message.text)
+
+
+@app.route('/' + TOKEN, methods=['POST'])
+def getMessage():
+    json_string = request.get_data().decode('utf-8')
+    update = telebot.types.Update.de_json(json_string)
+    bot.process_new_updates([update])
+    return '!', 200
+
+
+@app.route('/')
+def webhook():
+    bot.remove_webhook()
+    bot.set_webhook(url='https://mydomain.com/' + TOKEN)
+    return '!', 200

examples/serverless/flask_google_cloud_bot/requirements.txt

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+certifi==2022.12.7
+charset-normalizer==3.1.0
+click==8.0.3
+Flask==2.0.2
+idna==3.4
+importlib-metadata==6.4.1
+itsdangerous==2.0.1
+Jinja2==3.0.3
+MarkupSafe==2.0.1
+pyTelegramBotAPI==4.11.0
+requests==2.28.2
+urllib3==1.26.15
+Werkzeug==2.0.2
+zipp==3.15.0