Update runtime files

runtime/syntax/gitignore.vim

@@ -0,0 +1,29 @@
+" Vim syntax file
+" Language:	git ignore
+" Maintainer:	ObserverOfTime <chronobserver@disroot.org>
+" Filenames:	.gitignore, *.git/info/exclude
+" Last Change:	2022 Sep 10
+
+if exists('b:current_syntax')
+    finish
+endif
+
+" Comment
+syn keyword gitignoreTodo contained TODO FIXME XXX
+syn match gitignoreComment /^#.*/ contains=gitignoreTodo
+
+" Pattern
+syn match gitignorePattern /^#\@!.*$/ contains=gitignoreNegation,gitignoreGlob,gitignoreRange,gitignoreSeparator
+syn match gitignoreNegation /^!/ contained
+syn match gitignoreGlob /\\\@1<![?*]/ contained
+syn match gitignoreRange /\\\@1<!\[.\{-}\]/ contained
+syn match gitignoreSeparator '/' contained
+
+hi def link gitignoreComment Comment
+hi def link gitignoreGlob Special
+hi def link gitignoreNegation SpecialChar
+hi def link gitignoreRange Special
+hi def link gitignoreSeparator Delimiter
+hi def link gitignoreTodo Todo
+
+let b:current_syntax = 'gitignore'