feat(transaction): supporting transfer

[kehiy]

• Related Adding transaction support #1

[kehiy]

@b00f Transfer is already done. I decided to support transfer first. The only issues are:

1. we can't run tests because of package and folder management. (I need to study PythonW package management more)
2. I'm not sure where to calculate the fee in Transaction, amount, or Fee object. I think it must be a part of the Transaction.

[b00f]

Any idea how to fix the broken pipe?

[kehiy]

Any idea how to fix the broken pipe?

@b00f Here I explained:

#6 (comment)

It's package issues. I think my requirements file has issues maybe...