1.增加ASCII读写器及对应测试

2.修改文档

README.md

@@ -261,6 +261,7 @@ JT808Serializer JT808Serializer = new JT808Serializer(jT808Coonfig);
 | Package Name          | Version                                            | Downloads                                           |
 | --------------------- | -------------------------------------------------- | --------------------------------------------------- |
 | Install-Package JT808 | ![JT808](https://img.shields.io/nuget/v/JT808.svg) | ![JT808](https://img.shields.io/nuget/dt/JT808.svg) |
+| Install-Package JT808.Protocol.Extensions.JT1078 | ![JT808.Protocol.Extensions.JT1078](https://img.shields.io/nuget/v/JT808.Protocol.Extensions.JT1078.svg) | ![JT808](https://img.shields.io/nuget/dt/JT808.Protocol.Extensions.JT1078.svg) |
 
 ## 使用BenchmarkDotNet性能测试报告（只是玩玩，不能当真）
 

src/JT808.Protocol.Test/MessagePack/JT808MessagePackReaderTest.cs

@@ -83,6 +83,14 @@ namespace JT808.Protocol.Test.MessagePack
             Assert.Equal(JT808Package.EndFlag, jT808MessagePackReader.ReadEnd());
         }
 
+        [Fact]
+        public void ReadASCIITest()
+        {
+            byte[] array1 = new byte[] { 0x53, 0x56, 0x31, 0x2E, 0x31, 0x2E, 0x30 };
+            JT808MessagePackReader jT808MessagePackReader = new JT808MessagePackReader(array1);
+            Assert.Equal("SV1.1.0", jT808MessagePackReader.ReadASCII(7));
+        }
+
         [Theory]
         [InlineData("0000000000000000000000ABCDEF1234")]
         public void ReadHexTest(string hexStr)

src/JT808.Protocol.Test/MessagePack/JT808MessagePackWriterTest.cs

@@ -402,6 +402,17 @@ namespace JT808.Protocol.Test.MessagePack
             }
         }
 
+        [Fact]
+        public void WriteASCII()
+        {
+            byte[] array = new byte[4096];
+            byte[] array1 = new byte[] { 0x53,0x56,0x31,0x2E,0x31,0x2E,0x30 };
+            var msgpackWriter = new JT808MessagePackWriter(array);
+            msgpackWriter.WirteASCII("SV1.1.0");
+            var writeRealBytes = msgpackWriter.FlushAndGetRealArray();
+            Assert.Equal(array1, writeRealBytes);
+        }
+
         [Fact]
         public void CompositeTest1()
         {

src/JT808.Protocol/MessagePack/JT808MessagePackReader.cs

@@ -205,6 +205,12 @@ namespace JT808.Protocol.MessagePack
             string value = JT808Constants.Encoding.GetString(readOnlySpan.Slice(0, len).ToArray());
             return value.Trim('\0');
         }
+        public string ReadASCII(int len)
+        {
+            var readOnlySpan = GetReadOnlySpan(len);
+            string value = Encoding.ASCII.GetString(readOnlySpan.Slice(0, len).ToArray());
+            return value;
+        }
         public string ReadRemainStringContent()
         {
             var readOnlySpan = ReadContent(0);

src/JT808.Protocol/MessagePack/JT808MessagePackWriter.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Buffers;
 using System.Buffers.Binary;
+using System.Text;
 
 namespace JT808.Protocol.MessagePack
 {
@@ -285,6 +286,13 @@ namespace JT808.Protocol.MessagePack
             }
             writer.Advance(byteIndex);
         }
+        public void WirteASCII(string value)
+        {
+            var spanFree = writer.Free;
+            var bytes = Encoding.ASCII.GetBytes(value).AsSpan();
+            bytes.CopyTo(spanFree);
+            writer.Advance(bytes.Length);
+        }
         public void WriteFullEncode()
         {
             var tmpSpan = writer.Written;