enh(csharp) add contextual keywords file, args, dynamic, record, required and scoped (#4087)

Author: alvinsjoy

CHANGES.md

@@ -14,6 +14,7 @@ Core Grammars:
 - enh(erlang) OTP 27 Sigil type [nixxquality][]
 - enh(erlang) OTP25/27 maybe statement [nixxquality][]
 - enh(dart) Support digit-separators in number literals [Sam Rawlins][]
+- enh(csharp) add Contextual keywords `file`, `args`, `dynamic`, `record`, `required` and `scoped` [Alvin Joy][]
 
 New Grammars:
 
@@ -35,6 +36,7 @@ CONTRIBUTORS
 [William Wilkinson]: https://github.com/wilkinson4
 [nixxquality]: https://github.com/nixxquality
 [srawlins]: https://github.com/srawlins
+[Alvin Joy]: https://github.com/alvinsjoy
 
 
 ## Version 11.10.0

src/languages/csharp.js

@@ -117,11 +117,14 @@ export default function(hljs) {
     'alias',
     'and',
     'ascending',
+    'args',
     'async',
     'await',
     'by',
     'descending',
+    'dynamic',
     'equals',
+    'file',
     'from',
     'get',
     'global',
@@ -137,7 +140,10 @@ export default function(hljs) {
     'or',
     'orderby',
     'partial',
+    'record',
     'remove',
+    'required',
+    'scoped',
     'select',
     'set',
     'unmanaged',