Update the Go Quickstart README

[feorlen]

Improve the Go Quickstart:

• Update outdated installation command.
• Clarify the steps to run the file uploader example.
• Update text and formatting to more closely match the MinIO docs.

Since this repo doesn't use the Docs staging server, this direct link in GitHub is an easier way to see an overview of changes than reading the diff:
https://github.com/feorlen/minio-go/blob/update-readme-quickstart/README.md

Corresponding docs issue: minio/docs#1042

[feorlen]

This is what worked for me, is @latest appropriate here?

[harshavardhana]

No libraries do go get not go install - go install is meant for binaries.

[feorlen]

@harshavardhana is there more to know about how to use go get for the Go SDK? When I tried the original command, I got an error that said to use go install.

go-dev[feorlen]:~$ go get github.com/minio/minio-go/v7
go: go.mod file not found in current directory or any parent directory.
	'go get' is no longer supported outside a module.
	To build and install a command, use 'go install' with a version,
	like 'go install example.com/cmd@latest'
	For more information, see https://golang.org/doc/go-get-install-deprecation
	or run 'go help get' or 'go help install'.

go-dev[feorlen]:~/dev$ go install github.com/minio/minio-go/v7
go: 'go install' requires a version when current directory is not in a module
	Try 'go install github.com/minio/minio-go/v7@latest' to install the latest version

[harshavardhana]

You need a project folder first i.e

mkdir myproject
go mod init
go get github.com/minio/minio-go/v7@latest
.. then you code

[harshavardhana]

so if you are a Go developer you would know why this SDK says go get that is a pre-requisite we expect. We do not need to explain to them how to write Go or the tooling and ecosystem around it.

[harshavardhana]

If you read the error message

go: go.mod file not found in current directory or any parent directory.

That is generally explaining what it is expecting when you do go get

[feorlen]

Ah ok so my issue is order of operations. 👍🏻

[feorlen]

Feedback on these commands very welcome, this is what worked for me. I'm not sure the usual Go way of referring to these operations.

For now, this is not intended to be a comprehensive discussion. Just the basics for someone generally familiar with the language and tools.

[harshavardhana]

No libraries do go get not go install - go install is meant for binaries.

[djwfyi]

I can't comment on the actual Go coding part, but some suggestions for wording other parts of it.

[feorlen]

@harshavardhana Revised/clarified SDK install. I left a few of the potentially "unnecessary" commands so someone can copy/paste and run the sample code in their current directory. Let me know if there's anything else that could be improved.

[djwfyi]

LGTM