feat: Add syntax highlighting for markdown literals

Author: kdheepak

after/queries/julia/injections.scm

@@ -1,5 +1,16 @@
 ;; extends
 
+;; Match a prefixed string literal and capture the prefix and content.
+((prefixed_string_literal
+  ;; Capture the prefix identifier and assign it to @prefix.
+  prefix: (identifier) @prefix)
+  ;; Capture the entire string content and assign it to @injection.content.
+  @injection.content
+  ;; Check if the captured prefix is "md".
+  (#eq? @prefix "md")
+  ;; If the prefix is "md", set the injection language to "markdown".
+  (#set! injection.language "markdown"))
+
 ;; Inject Bash syntax highlighting into command_literal nodes.
 ((command_literal) @injection.content
   (#set! injection.language "bash"))