pbmmake, pgmmake, ppmlabel, ppmmake, ppmmix, ppmntsc, ppmpat: add pages (#11435)

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/common/pbmmake.md

@@ -0,0 +1,12 @@
+# pbmmake
+
+> Create a blank bitmap.
+> More information: <https://netpbm.sourceforge.net/doc/pbmmake.html>.
+
+- Create a blank bitmap of the specified dimensions:
+
+`pbmmake {{width}} {{height}} > {{path/to/output_file.pbm}}`
+
+- Specify the color of the created bitmap:
+
+`pbmmake -{{white|black|grey}} {{width}} {{height}} > {{path/to/output_file.pbm}}`