feat: add howtoplay and about routes with placeholder templates

handlers/about.py

@@ -0,0 +1,6 @@
+import tornado.web
+
+
+class AboutHandler(tornado.web.RequestHandler):
+    def get(self):
+        self.render("about.html")

handlers/howtoplay.py

@@ -0,0 +1,6 @@
+import tornado.web
+
+
+class HowToPlayHandler(tornado.web.RequestHandler):
+    def get(self):
+        self.render("howtoplay.html")