Add Language: Go+

## Language name
Go+

## URL of example repository
dir: https://github.com/uiuing/ingop/tree/main/releases-migration

repo: https://github.com/uiuing/ingop

File suffixes to check: `.gop` `.spx`

## Language repo
https://github.com/goplus/gop

## URL of syntax highlighting grammar
There's already an official TextMate-compatible grammar. See [goplus/vscode-goplus](https://github.com/goplus/vscode-goplus/blob/master/syntaxes/gop.tmLanguage.json).

## Detected language
does not show

## Recommended reasons for adding
The Go+ programming language is designed for engineering, STEM education, and data science.
More and more people will be using it afterwards, so I suggest adding the check.