Create a basic how-to for using craft-platforms

[lengau]

Create a how-to for users describing how to use craft-platforms to generate build plans for various crafts.

This can probably be fairly short as our primary users here will be the Launchpad team, but that also means we need it available before they fully utilise it.

We should get someone from Launchpad to review this when we implement it.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3869.

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[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3868.

This message was autogenerated

[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3870.

This message was autogenerated