tty-clock: add page (#21412)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/common/tty-clock.md

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+# tty-clock
+
+> A customizable terminal-based digital clock.
+> More information: <https://github.com/xorg62/tty-clock>.
+
+- Start the clock in the center of the terminal:
+
+`tty-clock -c`
+
+- Enable the display of seconds:
+
+`tty-clock -s`
+
+- Set the color of the clock using a color code (0-7):
+
+`tty-clock -C {{color_number}}`
+
+- Use a custom date format (strftime format):
+
+`tty-clock -f "{{%A, %B %d}}"`
+
+- Set a custom refresh delay in seconds (default is 1):
+
+`tty-clock -d {{seconds}}`
+
+- Exit the clock (while running):
+
+`<q>`