add Cipher service in Module ...

Interfaces/IXCipher.cs

@@ -0,0 +1,10 @@
+namespace xCommons.Interfaces
+{
+    public interface IXCipher
+    {
+        string Encrypt(string plainText);
+        string Decrypt(string cipherText);
+        string EncryptFromBytes(byte[] textBytes);
+        string DecryptFromBytes(byte[] cipherBytes);
+    }
+}