Support M487 board

Dependencies:   Modbus nvt_rs485

Revision:
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+# Getting started sample with modbus-RS485 on mbed OS
+
+
+### Import NuMaker-mbed-modbus-sample from on-line IDE
+1. Please choose Nuvoton NuMaker-PFM-XXX as your target platform.
+2. Please press the left-up icon "New", then choose "NuMaker Modbus-RS485" from the template list.
+3. Your NuMaker-mbed-modbus-sample program is existed.
+
+#### Now compile
+Please press compile icon.
+
+#### Burn Code & Execute
+1. Connect the board NuMaker-PFM-XXX with your PC by USB cable, then there will be one "mbed" disk.
+2. Copy the built binary file into "mbed" disk on you PC.
+3. Press device's reset button to execute, and you could get the below log by uart console.
+   And LED1, LED2 and LED3 will flash.
+-------------------------------------------------------------------------------
+We will set modbus slave ID-61(0x3d) for the device.
+
+--------------------------------------------------------------------------
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