feat: initial release of Developer Preview of DynamoDB Mapper for Kotlin

Author: ianbotsf

.changes/e4f3b5cb-9cdc-4bc7-b12d-e0a17b635f23.json

@@ -0,0 +1,9 @@
+{
+    "id": "e4f3b5cb-9cdc-4bc7-b12d-e0a17b635f23",
+    "type": "feature",
+    "description": "Initial release of Developer Preview of **DynamoDB Mapper** for Kotlin",
+    "issues": [
+        "awslabs/aws-sdk-kotlin#472"
+    ],
+    "module": "dynamodb-mapper"
+}