Update port status in readme

Author: microdev1

README.rst

@@ -95,7 +95,7 @@ Differences from `MicroPython <https://github.com/micropython/micropython>`__
 CircuitPython:
 
 -  Supports native USB on all boards, allowing file editing without special tools.
--  Supports only SAMD21, SAMD51, nRF52840, CXD56, STM32F4 and i.MX RT ports.
+-  Support status for ports is different.
 -  Floats (aka decimals) are enabled for all builds.
 -  Error messages are translated into 10+ languages.
 -  Does not support concurrency within Python (including interrupts and threading). Some concurrency
@@ -137,8 +137,8 @@ Behavior
 API
 ~~~
 
--  Unified hardware APIs. Documented
-   `on ReadTheDocs <https://circuitpython.readthedocs.io/en/latest/shared-bindings/index.html>`_.
+-  Unified hardware APIs. Documented on
+   `ReadTheDocs <https://circuitpython.readthedocs.io/en/latest/shared-bindings/index.html>`_.
 -  API docs are rST within the C files in ``shared-bindings``.
 -  No ``machine`` API.
 
@@ -201,14 +201,27 @@ Ports
 Ports include the code unique to a microcontroller line and also
 variations based on the board.
 
--  ``atmel-samd`` Support for SAMD21 and SAMD51 based boards.
--  ``nrf`` Support for the nRF52840 based boards.
--  ``unix`` Support for UNIX. Only used for automated testing.
+================  ============================================================
+Supported         Support status
+================  ============================================================
+atmel-samd        ``SAMD21`` stable | ``SAMD51`` stable
+cxd56             stable
+esp32s2           beta
+litex             alpha
+mimxrt10xx        alpha
+nrf               stable
+stm               ``F4`` stable | ``others`` beta
+unix              alpha
+================  ============================================================
+
+-  ``stable`` Highly unlikely to have bugs or missing functionality.
+-  ``beta``   Being actively improved but may be missing functionality and have bugs.
+-  ``alpha``  Will have bugs and missing functionality.
 
 The remaining port directories not listed above are in the repo to maintain compatibility with the
 `MicroPython <https://github.com/micropython/micropython>`__ parent project.
 
-`back to top <#circuitpython>`__
+`Back to Top <#circuitpython>`__
 
 .. |Build Status| image:: https://github.com/adafruit/circuitpython/workflows/Build%20CI/badge.svg
    :target: https://github.com/adafruit/circuitpython/actions?query=branch%3Amain