Docs: Enable RTD on tf-m-extras

Added files required for the tf-m-extras documentation to be displayed on Read the Docs.

Change-Id: I813589f566b58834dc75142b7a92349589d8da87
Signed-off-by: Elena Uziunaite <elena.uziunaite@arm.com>
diff --git a/docs/examples/examples.rst b/docs/examples/examples.rst
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+The list and simple introduction of the examples in this folder.
+
+###################
+corstone310_fvp_dma
+###################
+
+***********
+Description
+***********
+* DMA-350 Secure tests
+* Non-secure DMA-350 examples for the Corstone-310 FVP platform
+
+***********
+Maintainers
+***********
+- Bence Balogh `<bence.balogh@arm.com> <bence.balogh@arm.com>`_
+- Mark Horvath `<mark.horvath@arm.com> <mark.horvath@arm.com>`_
+
+#########################
+extra_test_suites_example
+#########################
+
+***********
+Description
+***********
+An example and template of out-of-tree build of extra regression test suites.
+
+***********
+Maintainers
+***********
+Jianliang Shen `<jianliang.shen@arm.com> <jianliang.shen@arm.com>`_
+
+#################
+example_partition
+#################
+
+***********
+Description
+***********
+A simple secure partition implementation.
+
+***********
+Maintainers
+***********
+Jianliang Shen `<jianliang.shen@arm.com> <jianliang.shen@arm.com>`_
+
+#########
+vad_an552
+#########
+
+***********
+Description
+***********
+Example application for the AN552 FPGA image, details can be found
+`here </examples/vad_an552/readme.rst>`.
+
+***********
+Maintainers
+***********
+- Gabor Toth `<gabor.toth@arm.com> <gabor.toth@arm.com>`_
+- Mark Horvath `<mark.horvath@arm.com> <mark.horvath@arm.com>`_
+
+---------------------------
+
+*Copyright (c) 2021-2022, Arm Limited. All rights reserved.*