Added DCOS blog post

Signed-off-by: Alberto Quario <realbot@gmail.com>

community.md

@@ -57,6 +57,7 @@ There are three main Github repos
 
 | Blog/repo name and description                                          | Author       | Site     | Date        |
 |---------------------------------------------------------------------|--------------|----------|-------------|
+| [OpenFaaS on DCOS](https://medium.com/@realrealbot/openfaas-on-dcos-9d5927f4e725) | Alberto Quario | medium.com/@realrealbot  | 20-Dec-2017
 | [Deploying Kubernetes On-Premise with RKE and deploying OpenFaaS on it — Part 1](https://medium.com/@kenfdev/deploying-kubernetes-on-premise-with-rke-and-deploying-openfaas-on-it-part-1-69a35ddfa507) | Ken Fukuyama | medium.com/@kenfdev  | 10-Dec-2017
 | [Deploying Kubernetes On-Premise with RKE and deploying OpenFaaS on it — Part 2](https://medium.com/@kenfdev/deploying-kubernetes-on-premise-with-rke-and-deploying-openfaas-on-it-part-2-cc14004e7007) | Ken Fukuyama | medium.com/@kenfdev  | 10-Dec-2017
 | [Overview of Functions as a Service with OpenFaas](https://mfarache.github.io/mfarache/Functions-As-A-Service-OpenFaas/) | Mauricio Farache | github.io  | 06-Dec-2017