Added a cryptography service to encrypt protected information (unused atm)

Corrected a bug when deleting recycle bin

ModernKeePass.Infrastructure/UWP/UwpCryptographyClient.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Threading.Tasks;
+using Windows.Security.Cryptography;
+using Windows.Security.Cryptography.DataProtection;
+using ModernKeePass.Application.Common.Interfaces;
+
+namespace ModernKeePass.Infrastructure.UWP
+{
+    public class UwpCryptographyClient: ICryptographyClient
+    {
+        public async Task<string> Protect(string value)
+        {
+            // Create a DataProtectionProvider object for the specified descriptor.
+            var provider = new DataProtectionProvider();
+
+            // Encode the plaintext input message to a buffer.
+            var buffMsg = CryptographicBuffer.ConvertStringToBinary(value, BinaryStringEncoding.Utf8);
+
+            // Encrypt the message.
+            var buffProtected = await provider.ProtectAsync(buffMsg);
+            
+            // Encode buffer to Base64
+            var stringProtected = CryptographicBuffer.EncodeToBase64String(buffProtected);
+
+            // Return the encrypted string.
+            return stringProtected;
+        }
+
+        public async Task<string> UnProtect(string value)
+        {
+            // Create a DataProtectionProvider object.
+            var provider = new DataProtectionProvider();
+
+            // Decode from Base64 string
+            var buffProtected = CryptographicBuffer.DecodeFromBase64String(value);
+
+            // Decrypt the protected message specified on input.
+            var buffUnprotected = await provider.UnprotectAsync(buffProtected);
+            
+            // Convert the unprotected message from an IBuffer object to a string.
+            var strClearText = CryptographicBuffer.ConvertBinaryToString(BinaryStringEncoding.Utf8, buffUnprotected);
+
+            // Return the plaintext string.
+            return strClearText;
+        }
+    }
+}