Issue candidate: add information on pre-requisites for full set up for new starters

[exploreriii]

As a new user to the go sdk

The README states

Installation
$ go get github.com/hiero-ledger/hiero-sdk-go/v2@latest

https://github.com/hiero-ledger/hiero-sdk-go

but as a new user I get:
hiero-sdk-go % go get github.com/hiero-ledger/hiero-sdk-go/v2@latest
zsh: command not found: go

The README should ideally document the full set up steps, and describe any pre-requisites

[0xivanov]

I think this would do the job: #1621 (comment)

@exploreriii what do you think?

[exploreriii]

Yes, this works, thanks for creating the PR

Even though you obviously need go to be able to use a go SDK - we have to consider the future possibility that e.g. a JS SDK developer one day decides they want to learn Go, so they buy a big textbook, read it, travel to the go SDK and find a good first issue

its a forward looking issue to when the ecosystem as a whole has more developers

We are already seeing developers switch a lot between the Python and C++ SDK, and we have seen some of the python SDK developers build Go side projects, so this may be a relevant issue one day