Add file with hints about PATH_MAX circumvention.

PATH-MAX-LIMIT.md

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+# PATH_MAX limit.
+
+In  case you  rush into  the  problem, that  you have  more slides  than
+PATH_MAX, which is  more than four thousand slides, there  is a solution
+with catpoint(1):
+
+1. Make a temporary file with the content of your presentation.
+2. Create some application to update the temporary file content.
+2. Either press reload or use SIGHUP to reload the file and slide.
+
+Using this  solution you lose some  commands in catpoint(1) but  will be
+able to scale to infinity.
+
+Another solution  would be  to use some  different kernel  or userspace,
+allowing more arguments to a command.
+
+Have fun!
+