Feature: Create a Helm chart

We need to create a helm chart that will deploy this app.
The requirments of the app:
* Should be Horizontally scalable.
* Each pod should use only one Slack Key.

The basic structure of the app will be:
* The app will run in a state full set.
* We pass the pod index to the app. Maybe use [this](https://stackoverflow.com/questions/50750672/is-there-a-way-to-get-ordinal-index-of-a-pod-with-in-kubernetes-statefulset-conf) which will be used as a key ID.
* If Slack key for that index doesn't exist the pod will just die.
* The Keys will be stored in a secret as a comma seperated list.