Add changelog

Author: RanVaknin

.changes/next-release/feature-AWSSDKforJavav2-e1e404e.json

@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "AWS SDK for Java v2",
+    "contributor": "",
+    "description": "Adding the version of the used service to the useragent"
+}