Infos about configuration

Can you explain the configuration more?

In readme.md when it says:
"You need to provide these environment variables in the current operating environment **or in a file:**"

_If one wants to put the config in a file, what is the name of the file and where should it be located?_

**Regarding environment variables:**

1. It says "you need to provide The Keystore file of the user who executed the contract"
_Where the Keystore file should be saved? Can we leave the default file name e.g. as provided by ioPay, or it must be renamed?_

2. VAULT_PASSWORD=
_What password should I use here? The password of the Keystore file?_

3. GAS_PRICE/GAS_LIMIT=
_What's the unit here? Rau or Qev?_

4. SLEEP_INTERVAL=
_What's the unit here? Seconds? Milliseconds?_