Improve README

[MartinDelille]

• The README.md should give basic information on how to get the bot running for non-python developer like me.
• It also could link to an existing bot on Telegram using this codebase (add CoolPollBot link to readme #22).

[alvarogzp]

Hello @MartinDelille, you are completely right, the README file needs to be improved and those two points you mention are important.

I need to find time to document it properly, but in the meantime, you can find a working bot on https://t.me/CoolPollBot.
In case you want to launch your own instance, the bot is run by executing the run.sh script (or the main.py if you want to handle dependencies and updates manually).
Prior to running, you must configure the auth token and admin user. It is explained here (just create a config dir on the root directory of the repository, write the auth token to a file called auth_token inside the config dir, and write your user id to admin_user_id and admin_chat_id).