Initial Rust project setup with dependencies and dataset

- Add Cargo.toml with TFHE, CSV, and Serde dependencies
- Add .gitignore for Rust target directory
- Include Iris dataset for machine learning experiments
- Add plain KNN implementation binary
- Update LICENSE to MIT and improve README

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.gitignore

@@ -0,0 +1 @@
+/target