add Linqpad script extension .linq to C#

[zyonet]

Description

LInqPad scripts are written in C# language with some linqpad related metadata added. Linqpad scripts have extension .linq and linqpad scripts in GitHub are not properly syntax highlighted. adding .linq extension to the C# language in languages.yml will fix this.

Checklist:

• I am associating a language with a new file extension.
  • The new extension is used in hundreds of repositories on GitHub.com
    • Search results for each extension:
      • https://github.com/search?p=100&q=extension%3Alinq+query+Statements+NOT+nothack&ref=searchresults&type=Code&utf8=%E2%9C%93
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • https://github.com/zyonet/PowerLinqPadScripts/blob/master/LinqPad5/chart-process-memory.linq
    • Sample license(s): MIT
  • I have included a change to the heuristics to distinguish my language from others using the same extension.

[pchaigno]

LGTM!

Here is what .linq files will look like once highlighted as C#: https://github-lightshow.herokuapp.com/?utf8=%E2%9C%93&scope=source.cs&grammar_format=cson&grammar_url=https%3A%2F%2Fgithub.com%2FAlhadis%2FAtom-PostScript%2Fblob%2Fmaster%2Fgrammars%2Fpostscript.cson&grammar_text=&code_source=from-url&code_url=https%3A%2F%2Fgithub.com%2Fgithub%2Flinguist%2Fblob%2Faef6346fb60b1a5a464345f443cd6f2f443350bb%2Fsamples%2FC%2523%2Fchart-process-memory.linq&code=.
It might be worth defining a new grammar that include the C# grammar and highlights the top annotations as XML, but I don't think it's blocking.

[yongzhao1]

@pchaigno Yes, it would be nice to change the grammar too to highlight the top linq query metadata. but I am not familiar with how to change the grammar. maybe it is my next todo. ;D

[lildude]

@yongzhao1 please update the template to link to the original source of the sample, and not your fork of Linguist. We need a record of where the file came from, not how it got into Linguist 😄

[yongzhao1]

@lildude it seems I could not change ( or how to change ;) the pull request details at this moment: the sample source code would be here after it has been merged.

[lildude]

it seems I could not change ( or how to change ;) the pull request details at this moment:

You should be able to edit the template by clicking the three dots in the top right corner of the comment in which you placed the template and select "Edit".

the sample source code would be here after it has been merged.

I know where it'll end up 😄 . I need to know where the file came from. Where did you get that file from? That's the link we need in the template.

[lildude]

Nevermind. I've found where the file comes from... it comes from a repo you own at https://github.com/zyonet/PowerLinqPadScripts/blob/master/LinqPad5/chart-process-memory.linq. I've updated the template to link to this file.

[yongzhao1]

@lildude: thanks!