Add Jule language

[adamperkowski]

Checklist

• I am adding a new language.
  • The extension of the new language is used in hundreds of repositories on GitHub.com.
    • Search results for each extension:
      • https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.jule
  • I have included a real-world usage sample for all extensions added in this PR
    • Sample source(s):
    • Sample license(s):
      • CC0 1.0 Universal (https://creativecommons.org/publicdomain/zero/1.0)
  • I have included a syntax highlighting grammar: https://github.com/julelang/vscode-jule/tree/master/syntaxes
  • I have added a color
    • Hex value: #5f7489
    • Rationale: Jule's logo color
  • I have updated the heuristics to distinguish my language from others using the same extension.

[lildude]

This language is still a long way from meeting usage requirements so won't be merged soon, but I've just noticed that the sample are not real-world usage examples of the language. Please replace these with real-world samples and not contrived examples illustrating concepts of the language.

[lildude]

I have included a real-world usage sample for all extensions added in this PR

Why have you removed the two lines below this rather than filling them in? We need to know where the files come from and the license covering each for legal reasons: eg we can't include proprietary code. Please add back those lines and fill them in.

As for the samples:

linguist/CONTRIBUTING.md

Line 130 in 2409807

**"Hello world" examples will not be accepted.**

Usage will be reviewed again when the next release is made.

[adamperkowski]

Why have you removed the two lines below this rather than filling them in? We need to know where the files come from and the license covering each for legal reasons: eg we can't include proprietary code. Please add back those lines and fill them in.

not sure because it was almost a year ago, but probably because as of opening this PR the samples didn't have sources nor licenses