Inserts natsbeat in the community beats list (elastic#9674)

Co-Authored-By: Stamatis Katsaounis <[email protected]>
Co-Authored-By: Christos Markou <[email protected]>

libbeat/docs/communitybeats.asciidoc

@@ -71,6 +71,7 @@ https://github.com/scottcrespo/mongobeat[mongobeat]:: Monitors MongoDB instances
 https://github.com/nathan-K-/mqttbeat[mqttbeat]:: Add messages from mqtt topics to Elasticsearch.
 https://github.com/adibendahan/mysqlbeat[mysqlbeat]:: Run any query on MySQL and send results to Elasticsearch.
 https://github.com/PhaedrusTheGreek/nagioscheckbeat[nagioscheckbeat]:: For Nagios checks and performance data.
+https://github.com/nfvsap/natsbeat[natsbeat]:: Collects data from NATS monitoring endpoints
 https://github.com/mrkschan/nginxbeat[nginxbeat]:: Reads status from Nginx.
 https://github.com/2Fast2BCn/nginxupstreambeat[nginxupstreambeat]:: Reads upstream status from nginx upstream module.
 https://github.com/mschneider82/nsqbeat[nsqbeat]:: Reads data from a NSQ topic.