Contact BotFather on Telegram (https://telegram.me/botfather) via private message and write the '/newbot' command. BotFather will ask you for a name (anything) and a username (globally unique). In return you will get an API token, looking like this:

110201543:AAHdqTcvCH1vGWJxfSeofSAs0K5PALDsaw

This token is used to authenticate requests to the bot API.

edit the api.py and copy your API key and Custom Search ID into the variables on top and build the container or start it without docker

Handy instructions are in the Makefile.

make build
TOKEN=110201543:AAHdqTcvCH1vGWJxfSeofSAs0K5PALDsaw make run

start the bot.py with your Token:

$ bot.py 110201543:AAHdqTcvCH1vGWJxfSeofSAs0K5PALDsaw

Add the bot to a telegram group or write a message to him with

/img query

The Google Custom Search API is limited to 100 search queries per day.