Moving structure as preparation for docs

src/AMWD.Protocols.Modbus.Serial/README.md

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+# Modbus Protocol for .NET | Serial
+
+The Modbus Serial protocol implementation.
+
+## Example
+
+A simple example which reads the voltage between L1 and N of a Janitza device.
+
+```csharp
+string serialPort = "COM5";
+
+using var client = new ModbusSerialClient(serialPort);
+await client.ConnectAsync(CancellationToken.None);
+
+byte unitId = 5;
+ushort startAddress = 19000;
+ushort count = 2;
+
+var registers = await client.ReadHoldingRegistersAsync(unitId, startAddress, count);
+float voltage = registers.GetSingle();
+
+Console.WriteLine($"The voltage of device #{unitId} between L1 and N is: {voltage:N2}V");
+```
+
+If you want to use the `ASCII` protocol instead, you can do this on initialization:
+
+```csharp
+// [...]
+
+using var client = new ModbusSerialClient(serialPort)
+{
+	Protocol = new AsciiProtocol();
+};
+
+// [...]
+```
+
+
+## Sources
+
+- Protocol Specification: [v1.1b3]
+- Modbus Serial line: [v1.02]
+
+
+---
+
+Published under MIT License (see [choose a license])
+
+
+
+[v1.1b3]:           https://modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf
+[v1.02]:            https://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
+[choose a license]: https://choosealicense.com/licenses/mit/