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add repo about key value repo

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@ -54,3 +54,36 @@ Contains write-only operations, such as [create](https://microutils.inmo.dev/mic
`update` operation consumes list of pairs with `Id` and `New` objects and produces list of `Registered` objects.
`deleteById` operation consumes list of `Id`s and do not consume anything except of notifying via `deletedObjectsIdsFlow`.
## KeyValue
Key-value repos has been created to support work with classic key-value stores, where keys are unique across all the repo when values are not unique.
As well as all the others types of repos, this one have two basic types:
[ReadKeyValueRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-read-key-value-repo/index.html) and
[WriteKeyValueRepo](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-key-value-repo/index.html)
### ReadKeyValueRepo
Read repo provides functions like: [contains](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-read-key-value-repo/contains.html),
[get](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-read-key-value-repo/get.html) or
[values](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-read-key-value-repo/values.html).
### WritekeyValueRepo
Contains write-only operations. This interface can be observed via its flows:
* [onNewValue](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-key-value-repo/on-new-value.html) to retrieve newely set values and keys
* [onValueRemoved](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-key-value-repo/on-value-removed.html) for the values removed from repo
> INFO:
>
> By default, all mutating operations consumes some collections. For example, [set](https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.repos/-write-key-value-repo/set.html)
> require `Map` with `Key`s and `Value`s and do not returns anything. Instead, it will throw notification via `onNewValue` flow
>
> All the methods on `WriteKeyValueRepo` have their variances with `pairs` (for set) or plain `vararg`s.
`set` operation consumes map of `Key`s and their `Value`s, set them and produces updates via `onNewValue`
`unset` operation consumes list of `Key`s, removing `Value` by `Key` and produces updates via `onValueRemoved`
`unsetWithValues` consumes list of `Value`s, removing all `Key`s with the `Value`s equal to one of the input `Value`s, and then produces updates via `onValueRemoved`