Libraries: Add LibMarkdown

Libraries/LibMarkdown/MDText.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <AK/String.h>
+#include <AK/Vector.h>
+
+class MDText final {
+public:
+    struct Style {
+        bool emph { false };
+        bool strong { false };
+        bool code { false };
+    };
+
+    struct Span {
+        String text;
+        Style style;
+    };
+
+    const Vector<Span>& spans() const { return m_spans; }
+
+    String render_to_html() const;
+    String render_for_terminal() const;
+
+    bool parse(const StringView&);
+
+private:
+    Vector<Span> m_spans;
+};