Add a reminder cookbook entry

source/_cookbook/send_a_reminder.markdown

@@ -0,0 +1,42 @@
+---
+layout: page
+title: "Send a reminder"
+description: "Send a reminder"
+date: 2015-12-16 08:00
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+#### {% linkable_title Send a reminder %}
+Always forget to eat lunch? Let Home Assistant send you a reminder.
+
+Add a [notify platform](/components/notify/) of your choice 
+
+```yaml
+notify:
+  - platform: xmpp
+    name: jabber
+    sender: YOUR_JID
+    password: YOUR_JABBER_ACCOUNT_PASSWORD
+    recipient: YOUR_RECIPIENT
+```
+
+and automation part to your `configuration.yaml` file.
+
+```yaml
+automation:
+  - alias: Send message at a given time
+    trigger:
+      platform: time
+      hours: 12
+      minutes: 15
+      seconds: 0
+    action:
+      service: notify.jabber
+      data:
+        message: 'Time for lunch'
+```
+
+