Add to usage and docs for git-add.sh

Signed-off-by: Chris Shoemaker <c.shoemaker@cox.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/git-add.txt

@@ -7,7 +7,7 @@ git-add - Add files to the cache.
 
 SYNOPSIS
 --------
-'git-add' <file>...
+'git-add' [-n] [-v] <file>...
 
 DESCRIPTION
 -----------
@@ -19,6 +19,13 @@ OPTIONS
 <file>...::
 	Files to add to the cache.
 
+-n::
+        Don't actually add the file(s), just show if they exist.
+
+-v::
+        Be verbose.
+
+
 Author
 ------
 Written by Linus Torvalds <torvalds@osdl.org>

git-add.sh

@@ -1,5 +1,9 @@
 #!/bin/sh
 
+usage() {
+    die "usage: git add [-n] [-v] <file>..."
+}
+
 show_only=
 verbose=
 while : ; do
@@ -10,6 +14,9 @@ while : ; do
     -v)
 	verbose=--verbose
 	;;
+    -*)
+	usage
+	;;
     *)
 	break
 	;;