cam: add page (#10526)

* cam: add page

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/cam.md

@@ -0,0 +1,20 @@
+# cam
+
+> Frontend tool for `libcamera`.
+> More information: <https://libcamera.org/docs.html>.
+
+- List available cameras:
+
+`cam --list`
+
+- List controls of a camera:
+
+`cam --camera {{camera_index}} --list-controls`
+
+- Write frames to a folder:
+
+`cam --camera {{camera_index}} --capture={{frames_to_capture}} --file`
+
+- Display camera feed in a window:
+
+`cam --camera {{camera_index}} --capture --sdl`