[PATCH] README: point to Documentation/SubmittingPatches

[Matthieu Moy <Matthieu.Moy@imag.fr>]

It was indeed not obvious for new contributors to find this document in
the source tree, since there were no reference to it outside the
Documentation/ directory.

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
---
> Thank you for the advice, I read README file (couldn't find a HACKING
> one) and the git website, and neither of those had a reference to
> SubmittingPatches..

Indeed. As a bonnus, here's a submission that should match the
guidelines (above --- is the commit message, and here is the place for
free comments).

 README |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/README b/README
index 67cfeb2..d2690ec 100644
--- a/README
+++ b/README
@@ -42,10 +42,12 @@ including full documentation and Git related tools.
 
 The user discussion and development of Git take place on the Git
 mailing list -- everyone is welcome to post bug reports, feature
-requests, comments and patches to git@vger.kernel.org. To subscribe
-to the list, send an email with just "subscribe git" in the body to
-majordomo@vger.kernel.org. The mailing list archives are available at
-http://marc.theaimsgroup.com/?l=git and other archival sites.
+requests, comments and patches to git@vger.kernel.org (read
+Documentation/SubmittingPatches for instructions on patch submission).
+To subscribe to the list, send an email with just "subscribe git" in
+the body to majordomo@vger.kernel.org. The mailing list archives are
+available at http://marc.theaimsgroup.com/?l=git and other archival
+sites.
 
 The messages titled "A note from the maintainer", "What's in
 git.git (stable)" and "What's cooking in git.git (topics)" and
-- 
1.7.9.111.gf3fb0.dirty