Initial modbustcp doc

docs/modbus_tcp.md

@@ -0,0 +1,17 @@
+# Modbus-TCP
+This is the documentation of the Modbus-TCP task
+
+## Table of contents
+- [Table of contents](#table-of-contents)
+- [Initialization](#initialization)
+- [Usage](#usage)
+
+## Initialization
+The Modbus task is initialized in the main function.
+```c
+// Initialize Modbus task
+modbus_init();
+```
+## Usage
+
+![QmodMaster.exe](./img/QmodMaster.png)