Follow this link and create a Bot through BotFather
Download the repo git clone github.com/marcossegovia/sammy-the-bot
Generate a sammy_brain.toml inside project root, at least like the following:
[configuration]
# Telegram bot token to be able to send/retrieve messages
telegram = "YOUR-TELEGRAM-BOT-TOKEN"
# http://openweathermap.org/ token to retrieve weather on your bot
weather = "YOUR-OPEN-WEATHER-MAP-DOT-ORG-TOKEN"