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>

Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "hfe_knn"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+tfhe = { version = "~1.2.0", features = ["integer"] }
+csv = "1.3"
+serde = { version = "1.0", features = ["derive"] }
+anyhow = "1.0"
+rand = "0.9"