Add opteed based on tspd

Adds a dispatcher for OP-TEE based on the test secure payload
dispatcher.

Fixes arm-software/tf-issues#239
diff --git a/docs/optee-dispatcher.md b/docs/optee-dispatcher.md
new file mode 100644
index 0000000..c154f6b
--- /dev/null
+++ b/docs/optee-dispatcher.md
@@ -0,0 +1,13 @@
+OP-TEE Dispatcher
+=================
+
+[OP-TEE OS] is a Trusted OS running as Secure EL1.
+
+To build and execute [OP-TEE OS] follow the instructions at
+[ARM Trusted Firmware with OP-TEE] [OP-TEE OS]
+
+- - - - - - - - - - - - - - - - - - - - - - - - - -
+
+_Copyright (c) 2014, ARM Limited and Contributors. All rights reserved._
+
+[OP-TEE OS]:  http://github.com/OP-TEE/optee_os/tree/master/documentation/arm_trusted_firmware.md