Add server implementation

MQTTnet.Core/Serializer/ByteReader.cs

@@ -0,0 +1,42 @@
+using System;
+
+namespace MQTTnet.Core.Serializer
+{
+    public class ByteReader
+    {
+        private int _index;
+        private readonly int _byte;
+
+        public ByteReader(byte @byte)
+        {
+            _byte = @byte;
+        }
+
+        public bool Read()
+        {
+            if (_index >= 8)
+            {
+                throw new InvalidOperationException("End of the byte reached.");
+            }
+
+            var result = ((1 << _index) & _byte) > 0;
+            _index++;
+
+            return result;
+        }
+
+        public byte Read(int count)
+        {
+            var result = 0;
+            for (var i = 0; i < count; i++)
+            {
+                if (Read())
+                {
+                    result |= 1 << i;
+                }
+            }
+
+            return (byte)result;
+        }
+    }
+}