Enhance README with badges for project information

Added badges for Lua version, license, and SmartThings Edge to README.

Author: blueyetisoftware

README.md

@@ -1,4 +1,7 @@
 # smartthings-edge-crypto
+![Lua 5.3+](https://img.shields.io/badge/Lua-5.3+-blue?style=flat-square)
+![License MIT](https://img.shields.io/badge/license-MIT-green?style=flat-square)
+![SmartThings Edge](https://img.shields.io/badge/SmartThings-Edge-orange?style=flat-square)
 
 Optimized cryptographic primitives for **SmartThings Edge drivers**