start the new topics route and view

app/routes/topics.py

@@ -0,0 +1,17 @@
+from flask import Blueprint, redirect, url_for, render_template
+
+from ..models import Topics
+
+bp = Blueprint('topics', __name__, url_prefix = '/topics/')
+
+@bp.get('/')
+def all_topics():
+    topic_list = Topics.get_list()
+    return render_template('topics/topics.html', topics=topic_list)
+
+@bp.get('/<slug>')
+def topic(slug):
+    t = Topics.find({'slug': slug})
+    if t:
+        return 'yes'
+    return 'no'