initial reusable component docs

[petersalomonsen]

Establishing using of children property in reusable components, using the Modal as an example.

connected to #125

[petersalomonsen]

@FREZZZBE @rubycop @Tguntenaar @Megha-Dev-19 based on our call. Let me know if we should use this as a starting point.

[petersalomonsen]

@race-of-sloths include

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Current status: executed

Reviewer	Score
@Tguntenaar	3

Your contribution is much appreciated with a final score of 3!
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[Tguntenaar]

LGTM

[Tguntenaar]

@race-of-sloths score 3