Introduce CI documentation for services and languages

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+## Using Redis
+
+It's possible to use Redis database test your apps during builds.
+
+### Use Redis with Docker executor
+
+If you are using our Docker integration you basically have everything already.
+
+1. Add this to your `.gitlab-ci.yml`:
+
+		services:
+		- redis
+
+2. Configure your application to use the database:
+
+		Host: redis
+
+3. You can also use any other available on [DockerHub](https://hub.docker.com/_/redis/). For example: `redis:2.6`.
+
+Example: https://gitlab.com/gitlab-examples/redis/blob/master/.gitlab-ci.yml
+
+### Use Redis with Shell executor
+
+It's possible to use Redis on manually configured servers that are using GitLab Runner with Shell executor.
+
+1. First install the Redis server:
+
+		sudo apt-get install redis-server
+
+2. Try to connect to the server:
+
+		# Try connecting the the Redis server
+		sudo -u gitlab-runner -H redis-cli
+
+		# Quit the session
+		127.0.0.1:6379> quit
+
+4. Configure your application to use the database:
+
+		Host: localhost