ppmtouil, pamtouil: add pages (#12414)

pages/common/pamtouil.md

@@ -0,0 +1,12 @@
+# pamtouil
+
+> Convert a PNM or PAM file into a Motif UIL icon file.
+> More information: <https://netpbm.sourceforge.net/doc/pamtouil.html>.
+
+- Convert a PNM or PAM file into a Motif UIL icon file:
+
+`pamtouil {{path/to/input.pnm|pam}} > {{path/to/output.uil}}`
+
+- Specify a prefix string to be printed in the output UIL file:
+
+`pamtouil -name {{uilname}} {{path/to/input.pnm|pam}} > {{path/to/output.uil}}`