Add Phel language

[JesusValera]

Add Phel programming language to linguist.

Issue: phel-lang/phel-lang#158

Description

There are more than 180 files in Github using the .phel extension and some projects were created from scratch like

• https://github.com/mabasic/mariobasic-n7
• https://github.com/Chemaclass/phel-snake

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?utf8=%E2%9C%93&type=Code&ref=searchresults&q=extension%3AFOOBAR+KEYWORDS+NOT+nothack
  • I have included a real-world usage sample for all extensions added in this PR:
    • https://github.com/JesusValera/linguist/blob/add-phel-language/samples/Phel/sample.phel
    • Sample license(s):
  • I have included a syntax highlighting grammar.
  • I have updated the heuristics to distinguish my language from others using the same extension.

The last two points are not selected because, it uses a Common Lisp grammar & the extension is unique (.phel).

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Please, let me know if something is missing, glad to keep improving the PR if necessary!

[Chemaclass]

Great idea! Highlighting phel files using common lisp would be a great improvement, especially people will be able to understand the code easier when reading it directly from GitHub 🧠💡

[lildude]

Popularity is not sufficient for inclusion yet, but that doesn't mean you can't address the identified issues in the mean time.

See inline comment.

Please remove the core.phel file. It's massive and waaaay too big.

Please also remove the sample.phel file as this is clearly a "Hello world" sample and not a real-world example.