Added multiplayer plugin

Assets/Mirror/Runtime/Transport/SimpleWebTransport/SslConfigLoader.cs

@@ -0,0 +1,49 @@
+using System.IO;
+using UnityEngine;
+
+namespace Mirror.SimpleWeb
+{
+    internal class SslConfigLoader
+    {
+        internal struct Cert
+        {
+            public string path;
+            public string password;
+        }
+        internal static SslConfig Load(SimpleWebTransport transport)
+        {
+            // dont need to load anything if ssl is not enabled
+            if (!transport.sslEnabled)
+                return default;
+
+            string certJsonPath = transport.sslCertJson;
+
+            Cert cert = LoadCertJson(certJsonPath);
+
+            return new SslConfig(
+                enabled: transport.sslEnabled,
+                sslProtocols: transport.sslProtocols,
+                certPath: cert.path,
+                certPassword: cert.password
+            );
+        }
+
+        internal static Cert LoadCertJson(string certJsonPath)
+        {
+            string json = File.ReadAllText(certJsonPath);
+            Cert cert = JsonUtility.FromJson<Cert>(json);
+
+            if (string.IsNullOrEmpty(cert.path))
+            {
+                throw new InvalidDataException("Cert Json didnt not contain \"path\"");
+            }
+            if (string.IsNullOrEmpty(cert.password))
+            {
+                // password can be empty
+                cert.password = string.Empty;
+            }
+
+            return cert;
+        }
+    }
+}