CodingGuidelines: mention whitespace preferences for shell scripts

Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index 09ffc46..46f8a3f 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -31,6 +31,10 @@
 
 For shell scripts specifically (not exhaustive):
 
+ - We use tabs for indentation.
+
+ - Case arms are indented at the same depth as case and esac lines.
+
  - We prefer $( ... ) for command substitution; unlike ``, it
    properly nests.  It should have been the way Bourne spelled
    it from day one, but unfortunately isn't.