chore(kb): start articles for monitoring stuff

knowledge base/beats.md

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+# Beats
+
+TODO
+
+Lightweight, free and open platform for single-purpose data shippers.
+
+Part of the Elastic Stack along with [ElasticSearch], [Kibana] and [Logstash].
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<!-- Uncomment if used
+<details>
+  <summary>Installation and configuration</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Usage</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Website]
+- [Main repository]
+- [ElasticSearch], [Kibana] and [Logstash]: the rest of the Elastic stack
+
+### Sources
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+[elasticsearch]: elasticsearch.md
+[kibana]: kibana.md
+[logstash]: logstash.md
+
+<!-- Files -->
+<!-- Upstream -->
+[main repository]: https://github.com/elastic/beats
+[website]: https://www.elastic.co/beats
+
+<!-- Others -->