Added Documentation

Added Test Cases
Added Comments

core/Cargo.toml

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+[package]
+name = "poker-api"
+version = "0.1.0"
+edition = "2021"
+authors = ["Poker API Team"]
+description = "High-performance poker hand evaluation library based on the Meerkat API algorithm"
+readme = "README.md"
+license = "MIT"
+repository = "https://github.com/your-org/poker-api"
+documentation = "https://docs.rs/poker-api"
+homepage = "https://github.com/your-org/poker-api"
+keywords = ["poker", "hand-evaluation", "texas-holdem", "gaming", "cards"]
+categories = ["games", "api-bindings", "mathematics"]
+exclude = ["docs/*", "target/*", "*.md"]
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+rand = "0.9.0"
+toml = "0.8.20"
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]