Added example how to use base64 encode/decode

[freekode]

Description:

How to use base64 encode/decode

Related issue (if applicable): fixes

Pull request in esphome with YAML changes (if applicable): esphome/esphome#4866

Checklist:

• [x] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• [ ] I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• [ ] Link added in /index.rst when creating new documents for new components or cookbook.

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[kroimon]

Important to note: this example doesn't compile without prior merging of #2933 and it's parent esphome/esphome#4860.

[freekode]

Yes, forgot mention it.

[github-actions[bot]]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days. Thank you for your contributions.