chore(postgres): start articles about replication systems

knowledge base/peerdb.md

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+# PeerDB
+
+Fast, simple, and cost effective Postgres replication.
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<!-- Uncomment if used
+<details>
+  <summary>Setup</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]
+- [Documentation]
+
+### Sources
+
+- [Public IPs For PeerDB Cloud]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+[documentation]: https://docs.peerdb.io/
+[main repository]: https://github.com/PeerDB-io/peerdb
+[website]: https://www.peerdb.io/
+[public ips for peerdb cloud]: https://docs.peerdb.io/peerdb-cloud/ip-table
+
+<!-- Others -->