add texinfo manual

Signed-off-by: Mattias Andrée <maandree@member.fsf.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/doc/info/chap/invoking.texinfo b/doc/info/chap/invoking.texinfo
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+@node Invoking
+@chapter Invoking
+
+@command{learn-your-telephone-number} takes exactly one
+argument: your telephone number. It will ask you to enter
+it --- so you should not invoke @command{learn-your-telephone-number}
+directly.
+
+If the telephone number you enters matches the specified
+number, the program will exit with status 0. If they do
+not match, the program will show the difference and exit
+with status 1.
+
+On failure the program exits with status 2.
+