add html writer

src/html.rs

@@ -0,0 +1,17 @@
+use crate::Event;
+
+pub fn push_html<'s, I: Iterator<Item = Event>>(s: &mut String, events: I) {
+    Writer::new(events).write()
+}
+
+struct Writer<I> {
+    events: I,
+}
+
+impl<I: Iterator<Item = Event>> Writer<I> {
+    fn new(events: I) -> Self {
+        Self { events }
+    }
+
+    fn write(self) {}
+}