ppmtv: add page (#11338)

* added ppmtv.md

* added ppmtv.md

* Update pages/common/ppmtv.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Update pages/common/ppmtv.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Update pages/common/ppmtv.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Update pages/common/ppmtv.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

---------

Co-authored-by: Darío Hereñú <magallania@gmail.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

pages/common/ppmtv.md

@@ -0,0 +1,17 @@
+# ppmtv
+
+> Make a PPM Image look like taken from an American TV.
+> Dim every other row of image data down by the specified dim factor (a number between 0 and 1).
+> More information: <https://netpbm.sourceforge.net/doc/ppmtv.html>.
+
+- Give the PPM image an American TV appearance:
+
+`ppmtv {{dim_factor}} {{path/to/file.ppm}} > {{path/to/output.ppm}}`
+
+- Suppress all informational messages:
+
+`ppmtv -quiet`
+
+- Display version:
+
+`ppmtv -version`