feat: udpate __crypto/aes_ctr_test

__crypto/aes_ctr_test/README.md

@@ -0,0 +1,23 @@
+
+Test Java codes:
+```java
+public class AesCtrTest {
+
+    public static void main(String[] args) throws Exception {
+        final byte[] key = new byte[]{
+                1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
+        };
+        final byte[] iv = new byte[]{
+                1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 0
+        };
+        final SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
+
+        final Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
+        cipher.init(Cipher.ENCRYPT_MODE, keySpec, new IvParameterSpec(iv));
+        System.out.println(Bytes.from(cipher.doFinal("hello world".getBytes())).asHex());
+        System.out.println(Bytes.from(cipher.doFinal(
+                "hello world.hello world.hello world.hello world.hello world.hello world.".getBytes())).asHex());
+    }
+}
+
+```