Add license badge to README

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jfreed-dev

README.md

@@ -1,6 +1,7 @@
 # Turing RK1 Ansible Cluster
 
 [![CI](https://github.com/jfreed-dev/turing-ansible-cluster/actions/workflows/ci.yml/badge.svg)](https://github.com/jfreed-dev/turing-ansible-cluster/actions/workflows/ci.yml)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
 Infrastructure-as-code for deploying K3s Kubernetes on Turing Pi RK1 hardware with NPU support.