added chapter map to README

21-asyncio/charfinder/http_charfinder.html

@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title>Charfinder</title>
+  </head>
+  <body>
+    Examples: {links}
+    <p>
+      <form action="/">
+        <input type="search" name="query" value="{query}">
+        <input type="submit" value="find"> {message}
+      </form>
+    </p>
+    <table>
+      {result}
+    </table>
+  </body>
+</html>