This fixes `make xbuild` on my Debian system

Use `go install` rather than `go get`:

https://go.dev/doc/go-get-install-deprecation

When run from cron, stdin is not a tty so gsheet would always expect
input making it impossible to read data. This change makes it so gsheet
only expects input when stdin is a tty OR if stdin and stdout are both
pipes and there is no data in stdin.

Should fix #7

type s/containt/contain/

* Implement sheetInfo command

This gets info about a spreadsheet by ID and outputs it as JSON.

* Show `gsheet -h` in readme

* Implement the title command

This command will return the title of a sheet given its id, ex:

gsheet title --id $GSHEET_ID --sheetid 1677410885

* Mention `gsheet title` in readme