Added modbus-proxy CLI tool

CliProxy/README.md

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+# Modbus CLI proxy
+
+This project contains a small CLI tool to proxy Modbus connections.
+
+```
+Usage: modbus-proxy --server <rtu|tcp> --client <rtu|tcp> [options]
+
+General options:
+  --help, -h
+    Shows this help message.
+
+  --debug
+    Waits for a debugger to be attached before starting.
+
+
+Server options:
+  --server <rtu|tcp>
+    Defines whether to use an RTU or an TCP proxy.
+
+  --server-baud #
+    The baud rate (e.g. 9600) to use for the RTU proxy. Default: 19200.
+
+  --server-databits #
+    The number of data bits. Default: 8.
+
+  --server-device <device-port>
+    The serial port to use (e.g. COM1, /dev/ttyS0).
+
+  --server-parity <none|odd|even>
+    The parity to use. Default: even.
+
+  --server-stopbits #
+    The number of stop bits. Default: 1.
+
+  --server-host <address>
+    The IP address to listen on. Default: 127.0.0.1.
+
+  --server-port #
+    The port to listen on. Default: 502.
+
+
+Client options:
+  --client <rtu|tcp>
+    Defines whether to use an RTU or an TCP client.
+
+  --client-protocol <ascii|rtu|tcp>
+    Select which Modbus protocol to use.
+
+  --client-baud #
+    The baud rate (e.g. 9600) to use for the RTU client. Default: 19200.
+
+  --client-databits #
+    The number of data bits. Default: 8.
+
+  --client-device <device-port>
+    The serial port to use (e.g. COM1, /dev/ttyS0).
+
+  --client-parity <none|odd|even>
+    The parity to use. Default: even.
+
+  --client-stopbits #
+    The number of stop bits. Default: 1.
+
+  --client-enable-rs485
+    Enables the RS485 software switch for serial adapters capable of RS232 and RS485.
+
+  --client-host <hostname>
+    The host to connect to.
+
+  --client-port #
+    The port to connect to. Default: 502.
+```
+
+
+---
+
+Published under MIT License (see [choose a license])
+
+
+
+[choose a license]: https://choosealicense.com/licenses/mit/