Add Jmk docs
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+.TH jmk 1 "13 March 2021" "1" "JMK build system"
+.SH SYNOPSIS
+JMK -- Build system for Bluejay
+.SH DESCRIPTION
+When run, JMK will search all subdirectories for files named "Jmk" and will
+process them to create a Makefile in the same directory.