Libraries: Add LibMarkdown

Author: https://github.com/bugaevc
Commit: 2e80b2b32f
Pull-request: https://github.com/SerenityOS/serenity/pull/609
Reviewed-by: https://github.com/awesomekling ✅

Libraries/LibMarkdown/MDCodeBlock.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <LibMarkdown/MDBlock.h>
+#include <LibMarkdown/MDText.h>
+
+class MDCodeBlock final : public MDBlock {
+public:
+    virtual ~MDCodeBlock() override {}
+
+    virtual String render_to_html() const override;
+    virtual String render_for_terminal() const override;
+    virtual bool parse(Vector<StringView>::ConstIterator& lines) override;
+
+private:
+    String style_language() const;
+    MDText::Style style() const;
+
+    String m_code;
+    MDText m_style_spec;
+};