rpicam-{hello,jpeg,raw,still,vid}: add page (#12078)

* rpicam-{hello,jpeg,raw,still,vid}: add page

---------

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/rpicam-hello.md

@@ -0,0 +1,12 @@
+# rpicam-hello
+
+> View a live camera stream using a Raspberry Pi camera.
+> More information: <https://www.raspberrypi.com/documentation/computers/camera_software.html#rpicam-hello>.
+
+- Display a camera preview stream for a specific amount of time (in milliseconds):
+
+`rpicam-hello -t {{time}}`
+
+- Tune the configuration for a particular camera sensor:
+
+`rpicam-hello --tuning-file {{/usr/share/libcamera/ipa/rpi/path/to/config.json}}`