Initialize README for SuperToken wrapper

Why:
Introduce initial README to describe the SuperToken wrapper
and repository scope so contributors have context.

Test plan:
- Open README.md and verify content renders.

Author: youngkidwarrior

README.md

@@ -0,0 +1,7 @@
+# Send Token V1
+
+Run tests:
+
+```sh
+bun run test
+```