add pdf-js viewer

webapp/views/components/Input.js

@@ -0,0 +1,10 @@
+import { h } from 'preact';
+
+export default function(props) {
+    return (
+        <label>
+            {props.text}:
+            <input onChange={props.onChange.bind(null, props.name)} type="text" />
+        </label>
+    );
+}