Platform: Adding Nuvoton M2351 Support

The NuMicro® M2351 microcontroller series is powered by Arm® Cortex®-M23
core with TrustZone® for Armv8-M architecture, which elevates the
traditional firmware security to the new level of robust software
security.

The porting will apply trusted-firmware-M to M2351 to make it easy to
create the security firmware on Nuvoton M2351 platform.

Signed-off-by: WSChang <wschang0@nuvoton.com>

Change-Id: I059618223fae8ab9ca085e9c998d51e3d12e8d86
diff --git a/docs/contributing/maintainers.rst b/docs/contributing/maintainers.rst
index a8bf34c..20a7693 100644
--- a/docs/contributing/maintainers.rst
+++ b/docs/contributing/maintainers.rst
@@ -111,7 +111,7 @@
     :github: `jamike <https://github.com/jamike>`__
 
 
-Cypress Platform: 
+Cypress Platform:
 ~~~~~~~~~~~~~~~~~
 
 Chris Brand
@@ -139,6 +139,13 @@
     :github: `oyvindronningstad <https://github.com/oyvindronningstad>`__
 
 
+Nuvoton Platform:
+~~~~~~~~~~~~~~~~~
+
+WS Chang
+    :email: `MS20 WSChang0@nuvoton.com <wschang0@nuvoton.com>`__
+    :github: `wschang0 <https://github.com/wschang0>`__
+
 =============
 
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