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-still.md

@@ -0,0 +1,16 @@
+# rpicam-still
+
+> Capture and store a photo using a Raspberry Pi camera with legacy features missing from `rpicam-jpeg`.
+> More information: <https://www.raspberrypi.com/documentation/computers/camera_software.html#rpicam-still>.
+
+- Capture a photo with different encoding:
+
+`rpicam-still -e {{bmp|png|rgb|yuv420}} -o {{path/to/file.{{bmp|png|rgb|yuv420}}}}`
+
+- Capture a raw image:
+
+`rpicam-still -r -o {{path/to/file.jpg}}`
+
+- Capture a 100 second exposure image:
+
+`rpicam-still -o {{path/to/file.jpg}} --shutter 100000`