Add blog post RPi Kubernetes with OpenFaaS

Adding blog post by Sean Duffy to the commynity
file

Signed-off-by: Martin Dekov <mvdekov@gmail.com>

community.md

@@ -98,6 +98,7 @@ Postponed events for 2020
 
 | Blog/repo name and description                                          | Author       | Site     | Date        |
 |-------------------------------------------------------------------------|--------------|----------|-------------|
+|[Raspberry Pi Kubernetes Cluster with OpenFaaS for Serverless Functions](https://www.shogan.co.uk/kubernetes/raspberry-pi-kubernetes-cluster-with-openfaas-for-serverless-functions-part-4/) | Sean Duffy | shogan.co.uk | 24-Mar-2020 |
 | [Telar Social one-click setup: OpenFaaS Cloud Community Cluster](https://medium.com/red-gold/telar-social-one-click-setup-openfaas-cloud-community-cluster-68814b3bf47c) | Amir Movahedi | medium.com | 22-Mar-2020
 | [OpenFaaS: Send email by a simple web application using Nodemailer](https://medium.com/red-gold/openfaas-send-email-web-application-using-nodemailer-8ec8d8ca714e) | Amir Movahedi | medium.com | 15-Mar-2020
 | [Pi & Kubernetes with k3s, k3sup, arkade and OpenFaaS](https://www.youtube.com/watch?v=ZiR3QEfBivk) | DJ Adams | Youtube | 08-Mar-2020