share/man: add manpage for `nitpackage`

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/share/man/nitpackage.md b/share/man/nitpackage.md
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+# NAME
+
+nitpackage - provide useful features to manage Nit packages.
+
+
+# SYNOPSIS
+
+nitpackage [*options*] FILE...
+
+
+# DESCRIPTION
+
+`nitpackage` provide packages related features.
+
+For now, only one thing is implemented: the *package expansion*.
+
+## Expanding packages
+
+The `--expand` option is used to move singleton packages in their own directory.
+
+For example, to move all singleton packages from `lib/` into directories, one can
+use the following command.
+
+~~~sh
+nitpackage --expand lib/
+~~~
+
+# OPTIONS
+
+### `--expand`
+Move singleton packages to their own directory.
+
+### `-h`, `-?`, `--help`
+Show Help (the list of options).