Add README with claude

Author: youknowone

README.md

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+pymath
+======
+
+A bit-compatible Rust implementation of Python's math library.
+
+## Overview
+
+`pymath` is a line-by-line port of the CPython math library to Rust. This library aims to provide mathematical functions that produce identical results to Python's standard math library at the bit level.
+
+## Implementation
+
+Each function has been carefully translated from CPython's C implementation to Rust, preserving the same algorithms, constants, and corner case handling. The code maintains the same numerical properties, but in Rust!
+
+## Usage
+
+```rust
+use pymath::{gamma, lgamma};
+
+fn main() {
+    // Get the same results as Python's math.gamma and math.lgamma
+    let gamma_result = gamma(4.5).unwrap();
+    let lgamma_result = lgamma(4.5).unwrap();
+}
+```