Add python-telegram-bot (#226)

* Add python-telegram-bot

Update

Update bot.py

* Update bot.py

* Update requirements.txt

examples/python-telegram-bot/Procfile

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+web: python bot.py

examples/python-telegram-bot/README.md

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+---
+title: Python Telegram Bot
+description: A Telegram Bot Written in Python
+tags:
+  - python
+  - python-discord-bot
+  - telegram
+---
+
+# Python-Telegram-Bot
+
+This example starts a Telegram bot using [python-telegram-bot](https://www.python-telegram-bot.org/) library.
+
+[![Deploy on Railway](https://railway.app/button.svg)](https://railway.app/new/template?template=https%3A%2F%2Fgithub.com%2Frailwayapp%2Fexamples%2Ftree%2Fmaster%2Fexamples%2Fpython-telegram-bot&envs=TOKEN&TOKENDesc=The+Telegram+Bot%27s+Token+%28Generate+a+token+from+%40BotFather+if+you+don%27t+have+one%21%29)
+
+## ✨ Features
+
+- Python
+- Python Telegram Bot
+
+## 💁‍♀️ How to use
+
+- Install packages using `pip install -r requirements.txt`
+- Start the bot using `python bot.py`
+
+## 📝 Notes
+
+This is a basic bot with the command `/start`, more information can be founded at the [offical documentation](https://python-telegram-bot.readthedocs.io/en/stable/).

examples/python-telegram-bot/bot.py

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+from telegram import Update
+from telegram.ext import Updater, CommandHandler, CallbackContext
+import os
+
+def start(update: Update, context: CallbackContext) -> None:
+    update.message.reply_text(f'Hello {update.effective_user.first_name}\nI am a sample Telegram bot made with python-telegram-bot!')
+
+updater = Updater(os.environ.get("TOKEN"), use_context=True)
+
+updater.dispatcher.add_handler(CommandHandler('start', start))
+
+print("Bot started successfully")
+
+updater.start_polling()
+updater.idle()

examples/python-telegram-bot/requirements.txt

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+python-telegram-bot