Describe the new contribution process using patch(1).

Reference: /n/patches.lsub.org/patch/newprocess
Date: Fri Apr 13 16:07:35 CES 2012
Signed-off-by: nemo@lsub.org

--- /PROCESS	Thu Jan  1 00:00:00 1970
+++ /PROCESS	Fri Apr 13 16:07:34 2012
@@ -0,0 +1,53 @@
+Contributers:
+
+If you'd like to contribute to NIX the following process has been
+created to simplify distributed development.  
+
+To be able to contribute you need to do three things:
+
+1.  Subscribe to the nix-dev mailing list
+http://groups.google.com/group/nix-dev (all development
+correspondance, including codereviews, goes here).
+
+2.  Download the nix distribution
+
+3.  Run it.
+
+
+4.  Submit patches using the following process
+
+In nix, run:
+
+patch/create patchname your@mail files-changed-or-removed...
+
+You should see  a mail in nix-dev in a while reporting the new patch.
+All patch reviewers will:
+
+patch/apply patchname
+
+...try it...
+
+patch/undo patchname
+
+and discuss it by mail, following up to the initial mail reporting the new
+patch.
+
+Perhaps you'd make more changes to address the issues discussed and,
+again:
+
+patch/create patchname your@mail files-changed-or-removed...
+
+Here, it's important that you use exactly the same patchname.
+
+The process continues until the patch has been LGTM'd.
+
+At that point, a maintainer of the nix distribution will
+
+patch/Apply patchname
+
+and, from that point in time, everyone running
+
+patch/pull
+
+will get your patch applied.
+