mcp25xx add read and write methods (#1959)

* add read and write methods for mcp2515

* fix add file to sln

* add bitrates and first test

* add test to bitrate

* set mode test

* add examples

* add to Readme read and write operations

* delete tabs

* use stackalloc

* refactor bitrate

* fix documentation
add max message size

* change read and write data to CanMessage object from byte array

* separate canMessage to received and sending message

* add tests

* extract enum to another file

* fix file formatting

* Make reading work for test device

Read should provide the data first, not test for it

* ReadAllBuffers private

* add ReceiveBuffer property to ReceivedCanMessage

Co-authored-by: Patrick Grawehr <pgrawehr@hotmail.com>

src/devices/Mcp25xxx/FrequencyAndSpeed.cs

@@ -0,0 +1,176 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Iot.Device.Mcp25xxx
+{
+    /// <summary>
+    /// Standard Frequency and Speed for CAN bus
+    /// </summary>
+    public enum FrequencyAndSpeed
+    {
+        /// <summary>
+        /// 8MHz 1000kBPS
+        /// </summary>
+        _8MHz1000KBps,
+
+        /// <summary>
+        /// 8MHz 500kBPS
+        /// </summary>
+        _8MHz500KBps,
+
+        /// <summary>
+        /// 8MHz 250kBPS
+        /// </summary>
+        _8MHz250KBps,
+
+        /// <summary>
+        /// 8MHz 200kBPS
+        /// </summary>
+        _8MHz200KBps,
+
+        /// <summary>
+        /// 8MHz 125kBPS
+        /// </summary>
+        _8MHz125KBps,
+
+        /// <summary>
+        /// 8MHz 100kBPS
+        /// </summary>
+        _8MHz100KBps,
+
+        /// <summary>
+        /// 8MHz 80kBPS
+        /// </summary>
+        _8MHz80KBps,
+
+        /// <summary>
+        /// 8MHz 50kBPS
+        /// </summary>
+        _8MHz50KBps,
+
+        /// <summary>
+        /// 8MHz 40kBPS
+        /// </summary>
+        _8MHz40KBps,
+
+        /// <summary>
+        /// 8MHz 20kBPS
+        /// </summary>
+        _8MHz20KBps,
+
+        /// <summary>
+        /// 8MHz 10kBPS
+        /// </summary>
+        _8MHz10KBps,
+
+        /// <summary>
+        /// 8MHz 5kBPS
+        /// </summary>
+        _8MHz5KBps,
+
+        /// <summary>
+        /// 16MHz 1000kBPS
+        /// </summary>
+        _16MHz1000KBps,
+
+        /// <summary>
+        /// 16MHz 500kBPS
+        /// </summary>
+        _16MHz500KBps,
+
+        /// <summary>
+        /// 16MHz 250kBPS
+        /// </summary>
+        _16MHz250KBps,
+
+        /// <summary>
+        /// 16MHz 200kBPS
+        /// </summary>
+        _16MHz200KBps,
+
+        /// <summary>
+        /// 16MHz 125kBPS
+        /// </summary>
+        _16MHz125KBps,
+
+        /// <summary>
+        /// 16MHz 100kBPS
+        /// </summary>
+        _16MHz100KBps,
+
+        /// <summary>
+        /// 16MHz 80kBPS
+        /// </summary>
+        _16MHz80KBps,
+
+        /// <summary>
+        /// 16MHz 50kBPS
+        /// </summary>
+        _16MHz50KBps,
+
+        /// <summary>
+        /// 16MHz 40kBPS
+        /// </summary>
+        _16MHz40KBps,
+
+        /// <summary>
+        /// 16MHz 20kBPS
+        /// </summary>
+        _16MHz20KBps,
+
+        /// <summary>
+        /// 16MHz 10kBPS
+        /// </summary>
+        _16MHz10KBps,
+
+        /// <summary>
+        /// 16MHz 5kBPS
+        /// </summary>
+        _16MHz5KBps,
+
+        /// <summary>
+        /// 20MHz 1000kBPS
+        /// </summary>
+        _20MHz1000KBps,
+
+        /// <summary>
+        /// 20MHz 500kBPS
+        /// </summary>
+        _20MHz500KBps,
+
+        /// <summary>
+        /// 20MHz 250kBPS
+        /// </summary>
+        _20MHz250KBps,
+
+        /// <summary>
+        /// 20MHz 200kBPS
+        /// </summary>
+        _20MHz200KBps,
+
+        /// <summary>
+        /// 20MHz 125kBPS
+        /// </summary>
+        _20MHz125KBps,
+
+        /// <summary>
+        /// 20MHz 100kBPS
+        /// </summary>
+        _20MHz100KBps,
+
+        /// <summary>
+        /// 20MHz 80kBPS
+        /// </summary>
+        _20MHz80KBps,
+
+        /// <summary>
+        /// 20MHz 50kBPS
+        /// </summary>
+        _20MHz50KBps,
+
+        /// <summary>
+        /// 20MHz 40kBPS
+        /// </summary>
+        _20MHz40KBps,
+    }
+}