[master] 7cd5fd3d5 doc: Add Getting started writing VMODs

[Nils Goroll]

commit 7cd5fd3d565b191a7a8b9dd5337e0b78691ef9ad
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Wed May 28 17:44:14 2025 +0200

    doc: Add Getting started writing VMODs

diff --git a/doc/sphinx/reference/vmod.rst b/doc/sphinx/reference/vmod.rst
index 20cb31b46..8b328894f 100644
--- a/doc/sphinx/reference/vmod.rst
+++ b/doc/sphinx/reference/vmod.rst
@@ -45,6 +45,20 @@ extensions written for Varnish Cache:
 
     https://www.varnish-cache.org/vmods
 
+Getting started writing VMODs
+=============================
+
+There are some projects which can help interested developers get started writing
+VMODs:
+
+.. _`Varnish Cache Development Kit`: https://git.sr.ht/~dridi/vcdk
+.. _`varnish-rs`: https://github.com/varnish-rs/varnish-rs
+
+* For the C programming language, there is the `Varnish Cache Development Kit`_
+  (VCDK)
+
+* Rustacians might want to have a look at `varnish-rs`_.
+
 The vmod.vcc file
 =================