docs/testing/ntfc: Add NTFC doc page

NTFC has its own documentation page so it can be referred to in other
locations.

Signed-off-by: Matteo Golin <matteo.golin@gmail.com>

Documentation/testing/ntfc.rst

@@ -0,0 +1,29 @@
+=========================================
+NTFC (NuttX Test Framework for Community)
+=========================================
+
+NTFC enables automated testing for NuttX across :doc:`simulator
+</platforms/sim/sim/index>`, QEMU, and real hardware via serial interface. The
+framework automatically detects available applications in NuttX images and
+executes applicable tests using pytest-based test cases.
+
+The framework and official test cases are available at:
+
+- https://github.com/apache/nuttx-ntfc
+- https://github.com/apache/nuttx-ntfc-testing
+
+Detailed documentation is available in the framework repository.
+
+CI migration to NTFC is in progress. Configurations currently using NTFC:
+
+- :doc:`risc-v/qemu-rv </platforms/risc-v/qemu-rv/index>`: ``rv-virt/citest64``
+- :doc:`risc-v/qemu-rv </platforms/risc-v/qemu-rv/index>`: ``rv-virt/citest``
+- :doc:`sim/sim </platforms/sim/sim/index>`: ``sim/citest``
+- :doc:`arm/imx6 </platforms/arm/imx6/index>`: ``sabre-6quad/citest``
+- :doc:`arm64/qemu </platforms/arm64/qemu/boards/qemu-armv8a/index>`: ``qemu-armv8a/citest``
+- :doc:`arm64/qemu </platforms/arm64/qemu/boards/qemu-armv8a/index>`: ``qemu-armv8a/citest_smp``
+
+NTFC exports test logs as CI artifacts. This allows test logs (including
+:doc:`ostest </applications/testing/ostest/index>` output) to be downloaded
+directly from the CI for all targets where the ``citest`` configuration is
+enabled.