Docs: Lists supported platforms in top-level readme.rst

Currently supported platforms only listed in changelog.rst
which is related the 1.0 release. Add the supported platforms
list also the live document which can be updated anytime
when a new platform contribution is merged.

Change-Id: Ie9bac7b452115be66449d0e8dd39f6aeae84debe
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
diff --git a/docs/changelog.rst b/docs/changelog.rst
index bb319ec..47e1ea7 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -74,9 +74,9 @@
 
 Other supported platforms:
 
-    - Dual Core Cortex-M system:
+    - Dual CPU system:
 
-        - `Cypress PSoc64.
+        - `Cypress PSoC64.
           <https://www.cypress.com/documentation/product-brochures/cypress-psoc-64-secure-microcontrollers>`__
 
 Platform Limitations
diff --git a/docs/readme.rst b/docs/readme.rst
index 4d805be..1787fb8 100644
--- a/docs/readme.rst
+++ b/docs/readme.rst
@@ -85,6 +85,37 @@
 
 Further documents can be found in the ``docs`` folder.
 
+###################
+Platforms supported
+###################
+    - Cortex-M33 system:
+
+        - `FPGA image loaded on MPS2 board.
+          <https://developer.arm.com/products/system-design/development-boards/cortex-m-prototyping-systems/mps2>`_
+        - `Fast model FVP_MPS2_AEMv8M.
+          <https://developer.arm.com/products/system-design/fixed-virtual-platforms>`_
+        - `Musca-A test chip board.
+          <https://developer.arm.com/products/system-design/development-boards/iot-test-chips-and-boards/musca-a-test-chip-board>`_
+        - `Musca-B1 test chip board.
+          <https://developer.arm.com/products/system-design/development-boards/iot-test-chips-and-boards/musca-b-test-chip-board>`_
+        - `Musca-S1 test chip board.
+          <https://developer.arm.com/tools-and-software/development-boards/iot-test-chips-and-boards/musca-s1-test-chip-board>`_
+        - `FPGA image loaded on MPS3 board.
+          <https://developer.arm.com/tools-and-software/development-boards/fpga-prototyping-boards/mps3>`_
+        - `Arm DesignStart FPGA on AWS Cloud.
+          <https://developer.arm.com/docs/101965/0102/arm-designstart-fpga-on-cloud-arm-ds-getting-started>`_
+        - `NXP LPC55S69.
+          <https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/lpc5500-cortex-m33/lpcxpresso55s69-development-board:LPC55S69-EVK>`_
+
+    - Cortex-M23 system:
+
+        - `FPGA image loaded on MPS2 board.
+          <https://developer.arm.com/products/system-design/development-boards/cortex-m-prototyping-systems/mps2>`_
+
+    - Dual Core Cortex-M system:
+
+        - `Cypress PSoc64.
+          <https://www.cypress.com/documentation/product-brochures/cypress-psoc-64-secure-microcontrollers>`_
 
 ####################
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