transaction: Initial commit to create a transaction id

Create a README file to describe the transaction id.
Hash specialization to create a unique transaction id
by combining the hash values of the dbus bus name and
message cookie.

Change-Id: Ida52774857a7ed2cca9364da15f84a30d2c3af06
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/Makefile.am b/Makefile.am
index 78ab597..377c62d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -16,6 +16,7 @@
 	sdbusplus/server/manager.hpp \
 	sdbusplus/server/match.hpp \
 	sdbusplus/server/object.hpp \
+	sdbusplus/server/transaction.hpp \
 	sdbusplus/slot.hpp \
 	sdbusplus/utility/tuple_to_array.hpp \
 	sdbusplus/utility/type_traits.hpp \