ppmtogif, pamtogif: add pages (#12409)

* ppmtogif, pamtogif: add pages

* Update pages/common/pamtogif.md

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/pamtogif.md

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+# pamtogif
+
+> Convert a Netpbm image into an unanimated GIF image.
+> See also: `giftopnm`, `gifsicle`.
+> More information: <https://netpbm.sourceforge.net/doc/pamtogif.html>.
+
+- Convert a Netpbm image into an unanimated GIF image:
+
+`pamtogif {{path/to/image.pam}} > {{path/to/output.gif}}`
+
+- Mark the specified color as transparent in the output GIF file:
+
+`pamtogif -transparent {{color}} {{path/to/image.pam}} > {{path/to/output.gif}}`
+
+- Include the specified text as a comment in the output GIF file:
+
+`pamtogif -comment "{{Hello World!}}" {{path/to/image.pam}} > {{path/to/output.gif}}`

pages/common/ppmtogif.md

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+# ppmtogif
+
+> This command is superseded by `pamtogif`.
+> More information: <https://netpbm.sourceforge.net/doc/ppmtogif.html>.
+
+- View documentation for the current command:
+
+`tldr pamtogif`