Add note to readme about development #777

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<Validation images> failed: The repository does not have images in the Readme file (More info: https://hacs.xyz/docs/publish/include#check-images )

<Validation hacsjson> failed: The repository has no 'hacs.json' file (More info: https://hacs.xyz/docs/publish/include#check-hacs-manifest )

<Validation information> failed: The repository has no information file (More info: https://hacs.xyz/docs/publish/include#check-info )

<Plugin Mariusthvdb/custom-ui> 3/7 checks failed

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

<Plugin Mariusthvdb/custom-ui> Selected version/branch 20240111 has been removed, falling back to default