No Writerside info on creating your own `Codec<T>` Implementation

[robertjamison]

When using the KStore Storage library, you have to initialize your KStore with some similar boilerplate code below:

val myStore = KStore<MyKstoreClass> = storeOf(
    codec = Codec<Any>,
    default = MyKstoreClass(),
    enableCache = true
)

This is very different from Android, iOS, and Desktop implementations. When you review the walkthrough documentation, there is almost no mention of how to implement this approach.

While Json is provided as a default, I recommend adding an example of creating your own Codec, like Protobuf or Cbor.

EDIT: Made the recommendation and issue title less vague

[robertjamison]

This issue resolution is linked to PR #158