Added url_for example

examples/url_for_example.py

@@ -0,0 +1,18 @@
+from sanic import Sanic
+from sanic import response
+
+app = Sanic(__name__)
+
+@app.route('/')
+async def index(request):
+    # generate a URL for the endpoint `post_handler`
+    url = app.url_for('post_handler', post_id=5)
+    # the URL is `/posts/5`, redirect to it
+    return response.redirect(url)
+
+@app.route('/posts/<post_id>')
+async def post_handler(request, post_id):
+    return response.text('Post - {}'.format(post_id))
+    
+if __name__ == '__main__':
+    app.run(host="0.0.0.0", port=8000, debug=True)