board: microsoft: surface-rt: add Microsoft Surface RT support

Surface RT is a hybrid tablet computer developed and manufactured
by Microsoft and shipped with Windows RT. The tablet uses a 1.3 GHz
quad-core Nvidia Tegra 3 chipset with 2 GB of RAM, features 10.8
inch 1366x768 screen and 32/64 GB of internal memory that can be
supplemented with a microSDXC card giving up to 200 GB of
additional storage.

Tested-by: Jethro Bull <jethrob@hotmail.com>
Signed-off-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/doc/board/microsoft/index.rst b/doc/board/microsoft/index.rst
new file mode 100644
index 0000000..107f352
--- /dev/null
+++ b/doc/board/microsoft/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Microsoft
+=========
+
+.. toctree::
+   :maxdepth: 2
+
+   surface-rt