Initial Client/Server Communication

#1
Followed the MagicOnion quickstart guide, borrowing code from the chat sample app to get something working

Assets/Scripts/MagicOnion/MetadataExtensions.cs

@@ -0,0 +1,62 @@
+using Grpc.Core;
+using System;
+
+namespace MagicOnion
+{
+    public static class MetadataExtensions
+    {
+        public const string BinarySuffix = "-bin";
+
+        /// <summary>
+        /// Get metdata entry. If does not exists, return null.
+        /// </summary>
+        public static Metadata.Entry Get(this Metadata metadata, string key, bool ignoreCase = true)
+        {
+            for (int i = 0; i < metadata.Count; i++)
+            {
+                var entry = metadata[i];
+                if (ignoreCase)
+                {
+                    if (entry.Key.Equals(key, StringComparison.OrdinalIgnoreCase))
+                    {
+                        return entry;
+                    }
+                }
+                else
+                {
+                    if (entry.Key == key)
+                    {
+                        return entry;
+                    }
+                }
+            }
+            return null;
+        }
+
+        /// <summary>
+        /// Get metdata string value. If does not exists, return null.
+        /// </summary>
+        public static string GetValue(this Metadata metadata, string key, bool ignoreCase = true)
+        {
+            for (int i = 0; i < metadata.Count; i++)
+            {
+                var entry = metadata[i];
+                if (ignoreCase)
+                {
+                    if (entry.Key.Equals(key, StringComparison.OrdinalIgnoreCase))
+                    {
+                        return entry.Value;
+                    }
+                }
+                else
+                {
+                    if (entry.Key == key)
+                    {
+                        return entry.Value;
+                    }
+                }
+            }
+            return null;
+        }
+    }
+}