feat: works

README.md

@@ -1,3 +1,41 @@
 # chacha20-poly1305-stream
 
-ChaCha20 Poly1305 stream encrypt and decrypt library
+ChaCha20 Poly1305 stream encrypt and decrypt library
+
+## Encrypt
+
+```rust
+// IMPORTANT! key and nonce SHOULD generate by random
+let key = [0u8; 32];
+let nonce = [0; 12];
+
+let mut encryptor = ChaCha20Poly1305StreamEncryptor::new(&key, &nonce).unwrap();
+
+let mut ciphertext = vec![];
+ciphertext.extend_from_slice(&encryptor.update(b"Hello "));
+ciphertext.extend_from_slice(&encryptor.update(b" World"));
+ciphertext.extend_from_slice(&encryptor.update(b"!"));
+let (last_block, tag) = encryptor.finalize();
+ciphertext.extend_from_slice(&last_block);
+ciphertext.extend_from_slice(&tag);
+
+println!("Ciphertext: {}", hex::encode(&ciphertext));
+```
+
+## Run Example
+
+```shell
+$ cargo run --example encrypt_and_decrypt
+    Finished dev [unoptimized + debuginfo] target(s) in 0.19s
+     Running `target/debug/examples/encrypt_and_decrypt`
+Ciphertext: d7628bd23a71182df7c8fb1852d3dc42b88a61e2fce340d9c5b323884d
+Plaintext : Hello  World!
+```
+
+Benchmark @MacBook Pro (Retina, 15-inch, Late 2013/2 GHz Quad-Core Intel Core i7)
+
+```shell
+$ cargo r --release --example bench
+ChaCha20Poly1305 encrypt         : 287.06 M/s
+ChaCha20Poly1305 encrypt/decrypt : 144.93 M/s
+```