added Url, Link and Image

src/lib.rs

@@ -1,3 +1,5 @@
+pub struct Url;
+
 pub struct RGBA {
     red: u8,
     green: u8,
@@ -26,6 +28,19 @@ pub struct Blockquote {
     text: String,
 }
 
+pub struct Link {
+    text: String,
+    url: Url,
+    title: Option<String>,
+}
+
+pub struct Image {
+    text: String,
+    image: Url,
+    title: Option<String>,
+    link: Option<Link>,
+}
+
 // TODO: able take care of lists i am too drunk for this tonight