hash: add hash documentation

Type: docs

Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Change-Id: I36764aa3c0e9657d228413aeafa0a54bbd755e49
diff --git a/docs/developer/corefeatures/index.rst b/docs/developer/corefeatures/index.rst
index 780fc83..f1b40b3 100644
--- a/docs/developer/corefeatures/index.rst
+++ b/docs/developer/corefeatures/index.rst
@@ -23,3 +23,4 @@
     stats
     selinux_doc
     policer
+    hash