Create community plugin list

plugins/COMMUNITY.md

+# Community Plugin List
+
+This file contains a list of community authored plugins for `nodeos`, acting as a directory of the plugins that are available.
+
+Third parties are encouraged to make pull requests to this file (`develop` branch please) in order to list new plugins.
+
+| Description | URL |
+| ----------- | --- |
+| Watch for specific actions and send them to an HTTP URL | https://github.com/eosauthority/eosio-watcher-plugin |
+| Kafka | https://github.com/TP-Lab/kafka_plugin |
+
+## DISCLAIMER:
+
+The fact that a plugin is listed in this file does not mean the plugin has been reviewed by this repository's maintainers.  No warranties are made, i.e. you are at your own risk if you choose to use them.