bioradtopgm: add page (#11071)

pages/common/bioradtopgm.md

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+# bioradtopgm
+
+> Convert a Biorad confocal file into a PGM file.
+> More information: <https://netpbm.sourceforge.net/doc/bioradtopgm.html>.
+
+- Read a Biorad confocal file and store the n'th image contained in it to as a PGM file:
+
+`bioradtopgm -{{n}} {{path/to/file.pic}} > {{path/to/file.pgm}}`
+
+- Read a Biorad confocal file and print the number of images it contains:
+
+`bioradtopgm {{path/to/file.pic}}`
+
+- Display version:
+
+`bioradtopgm -version`