docs: adding content for module 3

100-level-AsyncAPI-Intro/step2.md

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+As Eve and Chan begin building a communication system using AsyncAPI inside Chan's spaceship control room, Chan asks Eve if there is a standardized way of defining the communication system or if she defines the communication systems differently based on the particular use case.
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+Eve replies that AsyncAPI has a standardized way of defining communication systems. She explains to Chan that the communication system is defined using a specific structure within an AsyncAPI document. As it is much easier to understand things in action, Eve shows Chan how to structure components in an AsyncAPI document.