feat: Add Doxygen support (#578)

Author: jcs090218

.gitmodules

@@ -600,3 +600,9 @@
 	update = none
 	ignore = dirty
 	branch = main
+[submodule "repos/doxygen"]
+	path = repos/doxygen
+	url = https://github.com/tree-sitter-grammars/tree-sitter-doxygen
+	update = none
+	ignore = dirty
+	branch = master

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changelog
 
 ## Unreleased
+- Add `Doxygen` support
 
 ## 0.12.186 - 2024-05-02
 - Add `comment` support

queries/doxygen/highlights.scm

@@ -0,0 +1,53 @@
+((tag_name) @keyword
+  (#set! "priority" 105))
+
+[
+  "@code"
+  "@endcode"
+] @keyword
+
+(identifier) @variable
+
+((tag
+  (tag_name) @_param 
+  (identifier) @parameter)
+  (#any-of? @_param "@param" "\\param"))
+
+(function (identifier) @function)
+
+(function_link) @function
+
+(emphasis) @text.emphasis
+
+[
+  "\\a"
+  "\\c"
+] @tag
+
+(code_block_language) @label
+
+[
+  "in"
+  "out"
+  "inout"
+] @storageclass
+
+"~" @operator
+
+[
+  "<a"
+  ">"
+  "</a>"
+] @tag
+
+[
+  "."
+  ","
+  "::"
+  (code_block_start)
+  (code_block_end)
+] @punctuation.delimiter
+
+[ "(" ")" "{" "}" "[" "]" ] @punctuation.bracket
+
+(code_block_content) @none