Add project files.

PluginManager/Others/Cryptography.cs

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+namespace PluginManager.Others
+{
+    public class Cryptography
+    {
+        public static async System.Threading.Tasks.Task<string> CreateMD5(string text)
+        {
+            string output = "";
+            using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create())
+            {
+                using (var s = GenerateStreamFromString(text))
+                {
+                    byte[] t = await md5.ComputeHashAsync(s);
+                    output = System.Convert.ToBase64String(t);
+                }
+            }
+
+            return output;
+        }
+
+        public static async System.Threading.Tasks.Task<string> CreateSHA256(string text)
+        {
+            string output = "";
+            using (System.Security.Cryptography.SHA256 sha = System.Security.Cryptography.SHA256.Create())
+            {
+                using (var s = GenerateStreamFromString(text))
+                {
+                    byte[] t = await sha.ComputeHashAsync(s);
+                    output = System.Convert.ToBase64String(t);
+                }
+            }
+            return output;
+        }
+
+        public static System.IO.Stream GenerateStreamFromString(string s)
+        {
+            var stream = new System.IO.MemoryStream();
+            var writer = new System.IO.StreamWriter(stream);
+            writer.Write(s);
+            writer.Flush();
+            stream.Position = 0;
+            return stream;
+        }
+    }
+}