Add to readme information about conversion verification

README.md

@@ -1,2 +1,14 @@
 # avsc2avdl
 Avro Schema to Avro IDL converter
+
+Usage: avsc2avdl [*.avsc]
+
+The result schema, in Avro IDL format, will be printed to the standard output.
+
+The result schema can be verified by converting the schema back to AVSC format using official Avro Tools. [Download avro-tools-1.10.1.jar](https://downloads.apache.org/avro/avro-1.10.1/java/avro-tools-1.10.1.jar).
+
+```bash
+$ ./avsc2avdl inputschema.avsc > schema.avdl
+$ java -jar avro-tools-1.10.1.jar idl schema.avdl > recreated.avsc
+$ diff inputschema.avsc recreated.avsc
+```