chore: add resources found while looking for a local carddev server

knowledge base/webdav.md

@@ -0,0 +1,46 @@
+# WebDAV
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<!-- Uncomment if used
+<details>
+  <summary>Installation and configuration</summary>
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Usage</summary>
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+</details>
+-->
+
+## Further readings
+
+### Sources
+
+- [CalDAV]
+- [CardDAV]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+[caldav]: caldav.md
+[carddav]: carddav.md
+
+<!-- Files -->
+<!-- Upstream -->
+<!-- Others -->