Initial commit of home-assistant-solarfocus custom integration

[LavermanJJ]

• [x] Implement client library (https://pypi.org/project/pysolarfocus/ / https://github.com/LavermanJJ/pysolarfocus)
• [x] PR for home-assistant wheeler repo (https://github.com/LavermanJJ/wheels-custom-integrations)
• [x] PR for home-assistant brand repo (https://github.com/LavermanJJ/brands)
• [x] Fix translations
• [x] Write up readme
• [x] Convert values to 'int'

[LavermanJJ]

https://github.com/home-assistant/brands/pull/3463

[LavermanJJ]

https://github.com/home-assistant/wheels-custom-integrations/pull/633