assuming you are in the root directory and use vscode:
mkdir creds && code creds/credentials.json
add
{
"email": "<your email>",
"password": "<your password>"
}
After the first time running the app, you should be able to delete this file.
run the app with yarn dev
for reference
"scripts": {
"dev": "electron-webpack dev",
"compile": "electron-webpack",
"dist": "yarn compile && electron-builder",
"dist:dir": "yarn dist --dir -c.compression=store -c.mac.identity=null"
},