docs: Improved documentation

[svrooij]

Improved documentation

Description

The service template has been updated to better reflect the needed code.

Your checklist for this pull request

🚨 Please review the guidelines for contributing to this repository.

• [x] Make sure you are requesting to pull a topic/feature/bugfix branch (right side). Don't request your master!
• [x] Make sure you are making a pull request against the beta branch (left side). Also you should start your branch off svrooij/node-sonos-ts/beta.
• [x] Check the commit's or even all commits' message styles matches our requested structure.
• [x] Check your code additions will fail neither code linting checks nor unit test.
• [ ] Check you add tests for added code.

💔 Thank you!

[coveralls]

Pull Request Test Coverage Report for Build 493313500

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 77.852%

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Totals
Change from base Build 478435345:	0.0%
Covered Lines:	1228
Relevant Lines:	1595

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💛 - Coveralls

[github-actions[bot]]

:tada: This PR is included in version 2.3.0-beta.6 :tada:

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[github-actions[bot]]

:tada: This PR is included in version 2.3.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: