add syntax highlighting (WIP)

src/devtools/syntax_highlighting.hpp

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <string>
+#include <memory>
+
+struct FontStylesScheme;
+
+namespace devtools {
+    std::unique_ptr<FontStylesScheme> syntax_highlight(
+        const std::string& lang, std::string_view source
+    );
+}