* Makefile.am, configure.ac, index.html.in: Add initial version of
RTEMS Shell Manual. This is largely a starting point but has most of
the required structure.
* shell/.cvsignore, shell/Makefile.am, shell/file.t, shell/general.t,
shell/memory.t, shell/network.t, shell/preface.texi, shell/rtems.t,
shell/shell.texi: New files.
