[NEW EXAMPLE REQUEST] Create examples for the MemoryDbClient.

[scmacdon]

What are you trying to accomplish?

We need Java/Kotlin examples for the MemoryDbClient.

Which AWS services, if known, should this code example use?

[List the AWS service(s) that this code example should use, if you know them.]

Which AWS SDKs or tools, if known, should this code example use?

[List the AWS SDKs or tools that this code example should use, if you know them.]

Are there any similar code examples that could be leveraged?

[List any similar code examples that already exist in the Code Catalog, if you know of any.]

Any other related details we should know about?

[Provide any additional details here.]