README.source added to explain packaging workflow

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+The Debian packaging of pcre2 is maintained in git, using the merging
+workflow described in dgit-maint-merge(7).  There isn't a patch
+queue that can be represented as a quilt series.
+
+A detailed breakdown of the changes is available from their
+canonical representation - git commits in the packaging repository.
+For example, to see the changes made by the Debian maintainer in
+the first upload of upstream version 1.2.3, you could use:
+
+    % git clone https://git.dgit.debian.org/pcre2
+    % cd pcre2
+    % git log --oneline 1.2.3..debian/1.2.3-1 -- . ':!debian'
+
+(If you have dgit, use `dgit clone pcre2`, rather than plain `git
+clone`.)
+
+ -- Matthew Vernon <matthew@debian.org>, Thu, 30 Nov 2017 14:16:33 +0000