Slack applicatiaon should be run on your computer

You may need to generate token here https://api.slack.com/custom-integrations/legacy-tokens

Create .env file in the root folder and put next line there SLACK_TOKEN=Your-legacy-token-goes-here

Warining: Below is not valid token, just example how it can look //It is dangerous to share my actual token because the wrong code can spam our corporate slack from my name. SLACK_TOKEN=xoxp-9999999999-8888888888-262404917104-671757f32e432c9dafa174c043474368