Quickstart installation

[GhoulKingR]

I recently updated to go1.20.5, and in installing the framework with the command in this guide, I got this error:

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'.

I don't know if this only applies to this version of GO, but it'll be nice to add this new information for better quality.

Edit: I returned to read this issue and noticed it may be confusing. For context, the guide is here: https://gin-gonic.com/docs/quickstart/
I ran into this issue on the first step. And I have a pull request that attempts to clarify prevent more users like me from running into the issue: #232

[custs21113]

hey bro, my version is 1.20.6, when i run go get -u github.com/gin-gonic/gin in terminal, and it run well.
Maybe you doesn't run the command under a go module.

1. mkdir go_demo && cd go_demo && go mod init go_demo
2. go get -u github.com/gin-gonic/gin

I recently updated to go1.20.5, and in installing the framework with the command in this guide, I got this error:

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'.

I don't know if this only applies to this version of GO, but it'll be nice to add this new information for better quality.

[GhoulKingR]

Thanks, it works better now.

I'm not as experienced in go, so I didn't know to do that. I also don't know if that's something everyone knows or maybe something to add to the pull request.

Would it be okay to add that to the pull request?