Add libcamera to Users.md [skip ci]

Add the libcamera project as a user of Meson.

docs/markdown/Users.md

@@ -54,6 +54,7 @@ listed in the [`meson` GitHub topic](https://github.com/topics/meson).
  - [Knot Resolver](https://gitlab.labs.nic.cz/knot/knot-resolver), Full caching DNS resolver implementation
  - [Ksh](https://github.com/att/ast), a Korn Shell
  - [Lc0](https://github.com/LeelaChessZero/lc0), LeelaChessZero is a UCI-compliant chess engine designed to play chess via neural network
+ - [libcamera](https://git.linuxtv.org/libcamera.git/), a library to handle complex cameras on Linux, ChromeOS and Android
  - [Libdrm](https://cgit.freedesktop.org/drm/libdrm/), a library for abstracting DRM kernel interfaces
  - [Libepoxy](https://github.com/anholt/libepoxy/), a library for handling OpenGL function pointer management
  - [libfuse](https://github.com/libfuse/libfuse), the reference implementation of the Linux FUSE (Filesystem in Userspace) interface