Modify the file main.cpp for M487

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+# Getting started sample with I2C slave device on mbed OS
+
+
+### Import NuMaker-mbed-NuBrick-example 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 Brick I2C slave devices" from the template list.
+3. Your NuMaker-mbed-NuBrick-example 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, user could test I2C slave devices.
+   
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