Create pypi alias for home-assistant. (#2782)

Author: janiversen

MAKE_RELEASE.rst

@@ -21,6 +21,7 @@ Prepare/make release on dev.
         cd doc; ./build_html
    * rm -rf build/* dist/*
    * python3 -m build
+   * pypi-alias pymodbus_ha_core
    * twine check dist/*
    * Commit, push and merge.
    * Wait for CI to complete

README.rst

@@ -48,6 +48,24 @@ Source code on `github <https://github.com/pymodbus-dev/pymodbus>`_
 
 Full documentation for newest releases as well as the bleeding edge (dev) `readthedocs <https://pymodbus.readthedocs.io>`_
 
+pymodbus is maintained in 2 versions:
+- pymodbus, the official library
+- pymodbus_ha_core
+
+Pymodbus_ha_core
+----------------
+`Pymodbus_ha_core <https://pypi.org/project/pymodbus-ha-core/>`_ is
+an alias to pymodbus, available on pypi.org.
+
+Being an alias means it is 100% the same as pymodbus, without any extra
+code, just another name.
+
+This allows home-assistant to use a pymodbus version for the modbus integration,
+while custom_components use another version.
+
+We are offering to make other aliases for projects who need this, please
+open an issue in the pymodbus project, with an explanation of why it is
+needed.
 
 Pymodbus in a nutshell
 ----------------------