chore: add missing readme

Author: vmihailenco

example/scan-struct/README.md

@@ -0,0 +1,11 @@
+# Example for scanning hash fields into a struct
+
+To run this example:
+
+```shell
+go run .
+```
+
+See
+[Redis: Scanning hash fields into a struct](https://redis.uptrace.dev/guide/scanning-hash-fields.html)
+for details.