[Feature] Add helm chart for configuration of options

[alexellis]

Feature

Add helm chart for configuration of options and for discoverability

The other event-connectors maintain their charts in the faas-netes repo: https://github.com/openfaas/faas-netes/tree/master/chart

Related: #29

[alexellis]

@embano1 do you want to pick this up, this week? You could use the connector from the Kafka chart as an example, see the faas-netes repo.

[embano1]

Please assign me @alexellis (but give me a week as I'm travelling)