add docs and example

Author: orhanhenrik

README.md

@@ -43,6 +43,9 @@ $ yarn start
 - `MONGO_URL`
   - Url to the database connection
   - `default`: `mongodb://localhost:27017/vote`
+- `REDIS_URL`
+  - Hostname of the redis server
+  - `default`: `localhost`
 - `LOGO_SRC` _(optional)_
   - Url to the main logo on all pages
   - `default`: `/static/images/Abakule.jpg`

deployment/docker-compose.yml

@@ -3,11 +3,14 @@ version: '2'
 services:
   mongo:
     image: mongo:3.6
+  redis:
+    image: redis:latest
   vote:
     image: abakus/vote:latest
     environment:
       # Reed more about these in the README-file in the base directory
       MONGO_URL: 'mongodb://mongo:27017/vote'
+      REDIS_URL: 'redis'
       COOKIE_SECRET: 'long-secret-here-is-important'
       LOGO_SRC: 'https://raw.githubusercontent.com/webkom/lego/master/assets/abakus_webkom.png'
     ports: