add information to ERC-20 Guide

[FunkyLSD]

During the contract deployment, I encountered a number of problems. In order to make the guide simpler and more understandable, you need to:

1. Specify which version of Node.js is required.
2. In paragraph 8 and further, you need to specify in which directory the command should be executed.
3. Add which values ​​can be changed to change the name, attributes, and number of tokens.

[jcvernaleo]

Thanks for the feedback!

As we update the docs, we'll make sure to look closely at that bit of it and your suggestions.