Add git repo example by Ignacio Cabrera

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

community.md

@@ -66,6 +66,7 @@ It would be great to hear from you especially if you have any of the above and w
 
 | Blog/repo name and description                                          | Author       | Site     | Date        |
 |---------------------------------------------------------------------|--------------|----------|-------------|
+| [Node Gatekeeper - a HMAC wrapper for Node.js](https://github.com/cabrerabywaters/faas-node-gatekeeper) | Ignacio Cabrera | github.com | 28-Feb-2019 |
 | [Favorite Tools - OpenFaaS](https://fischbacher.rocks/post/tools-openfaas/) | Markus Fischbacher | [fischbacher.rocks](fischbacher.rocks) | 5-Feb-2019 |  
 | [Serverless with OpenFaaS](https://blog.cloudstack.pl/serverless-with-openfaas/) | Daniel Noworyta | blog.cloudstack.pl | 5-Mar-2019 |
 | [OpenFaas on Docker Swarm on Raspberry Pi](http://www.timlevett.com/2019/03/openfaas-on-docker-swarm-on-raspberry-pi.html) | Tim Levett | timlevett.com | 4-Mar-2019  |