[PATCH 4/4] docs: Add ABI documentation

[Neil Horman <nhorman-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org>]

Adding a document describing rudimentary ABI policy and adding notice space for
any deprecation announcements

Signed-off-by: Neil Horman <nhorman-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org>
CC: Thomas Monjalon <thomas.monjalon-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>
CC: "Richardson, Bruce" <bruce.richardson-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
 doc/abi.txt | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 doc/abi.txt

diff --git a/doc/abi.txt b/doc/abi.txt
new file mode 100644
index 0000000..b6dcc7d
--- /dev/null
+++ b/doc/abi.txt
@@ -0,0 +1,17 @@
+ABI policy:
+	ABI versions are set at the time of major release labeling, and ABI may
+change multiple times between the last labeling and the HEAD label of the git
+tree without warning
+
+	ABI versions, once released are available until such time as their
+deprecation has been noted here for at least one major release cycle, after it
+has been tagged.  E.g. the ABI for DPDK 1.8 is shipped, and then the decision to
+remove it is made during the development of DPDK 1.9.  The decision will be
+recorded here, shipped with the DPDK 1.9 release, and actually removed when DPDK
+1.10 ships.
+
+	ABI versions may be deprecated in whole, or in part as needed by a given
+update.
+
+Deprecation Notices:
+
-- 
1.9.3