Add DynamoDB AttributeValue to list of community formats (#2607)

Author: diegojfer

formats/README.md

@@ -34,3 +34,4 @@ For convenience, they have same `groupId`, versioning and release cycle as core
 | CSV                      | [hfhbd/kotlinx-serialization-csv](https://github.com/hfhbd/kotlinx-serialization-csv) <br> `app.softwork:kotlinx-serialization-csv`                      | all supported platforms | Allows serialization and deserialization of CSV files. There are still some limitations (ordered properties).                                                                                                                                                                                                                                                                                                                                              |
 | Fixed Length Format      | [hfhbd/kotlinx-serialization-csv](https://github.com/hfhbd/kotlinx-serialization-csv) <br> `app.softwork:kotlinx-serialization-flf`                      | all supported platforms | Allows serialization and deserialization of [Fixed Length Format files](https://www.ibm.com/docs/en/psfa/7.2.1?topic=format-fixed-length-files). Each property must be annotated with `@FixedLength` and there are still some limitations due to missing delimiters.                                                                                                                                                                                       |
 | JSON5                    | [xn32/json5k](https://github.com/xn32/json5k) <br> `io.github.xn32:json5k`                                                                               | JVM, Native             | Library for the serialization to and deserialization from [JSON5](https://json5.org) text.                                                                                                                                                                                                                                                                                                                                                                 |
+| DynamoDB                 | [DynaMap](https://github.com/codanbaru/dynamap) <br> `com.codanbaru.kotlin:dynamap`                                                                      | JVM                     | Allows serialization and deserialization of objects to and from [AttributeValue](https://sdk.amazonaws.com/kotlin/api/latest/dynamodb/aws.sdk.kotlin.services.dynamodb.model/-attribute-value/index.html) of Amazon [DynamoDB](https://aws.amazon.com/dynamodb/)                                                                                                                                                                                           |