enh(grammars): Add HLSL to SUPPORTED_LANGUAGES.md (#3002)

Author: stef-levesque

CHANGES.md

@@ -3,6 +3,7 @@
 New Languages:
 
 - Added 3rd party RiScript grammar to SUPPORTED_LANGUAGES (#2988) [John C][]
+- Added 3rd party HLSL grammar to SUPPORTED_LANGUAGES (#3002) [Stef Levesque][]
 
 Language grammar improvements:
 
@@ -12,6 +13,7 @@ Language grammar improvements:
 - enh(php) Add `mixed` to list of keywords (#2997) [Ayesh][]
 - enh(php) Add support binary, octal, hex and scientific numerals with underscore separator support (#2997) [Ayesh][]
 
+[Stef Levesque]: https://github.com/stef-levesque
 [Josh Goebel]: https://github.com/joshgoebel
 [John Cheung]: https://github.com/Real-John-Cheung
 [xDGameStudios]: https://github.com/xDGameStudios

SUPPORTED_LANGUAGES.md

@@ -90,6 +90,7 @@ Languages that listed a **Package** below are 3rd party languages and are not bu
 | Handlebars              | handlebars, hbs, html.hbs, html.handlebars        | |
 | Haskell                 | haskell, hs            |         |
 | Haxe                    | haxe, hx               |         |
+| High-level shader language| hlsl                | [highlightjs-hlsl](https://github.com/highlightjs/highlightjs-hlsl) |
 | Hy                      | hy, hylang             |         |
 | Ini, TOML               | ini, toml              |         |
 | Inform7                 | inform7, i7            |         |