uvcdynctrl : add page (#3408)

pages/linux/uvcdynctrl.md

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+# uvcdynctrl
+
+> A libwebcam command line tool to manage dynamic controls in uvcvideo.
+
+- List all available cameras:
+
+`uvcdynctrl -l`
+
+- Specify the device to use (defaults to `video0`):
+
+`uvcdynctrl -d {{device_name}}`
+
+- List available controls:
+
+`uvcdynctrl -c`
+
+- Set a new control value (for negative values, add -- before {{-value}}):
+
+`uvcdynctrl -s {{control_name}} {{value}}`
+
+- Get the current control value:
+
+`uvcdynctrl -g {{control_name}}`
+
+- Save the state of the current controls to a file:
+
+`uvcdynctrl -W {{file_name}}`
+
+- Load the state of the controls from a file:
+
+`uvcdynctrl -L {{file_name}}`