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Add info on mbed_app.json

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`@@ -102,6 +102,12 @@ mkdir -p variants/$BRAND_NEW_BOARD_NAME/{libs,conf}`
`102`	`102`	`./mbed-os-to-arduino -r /path/to/mbed-os/fork/that/supports/new/board $BRAND_NEW_BOARD_NAME:$BRAND_NEW_BOARD_NAME`
`103`	`103`	```
`104`	`104`
	`105`	`+### Customizing Mbed OS build without modifying the code`
	`106`	`+`
	`107`	+Most Mbed OS defines can be tuned using a project file called `mbed_app.json` . In case you need to tune a build you can add that file to your variant's `conf` folder. One example is https://github.com/arduino/ArduinoCore-mbed/blob/master/variants/PORTENTA_H7_M7/conf/mbed_app.json .
	`108`	`+Providing an invalid json or replacing a non-existing property will make the build fail silently, so it's always better to validate that file with a standard Mbed OS project.`
	`109`	`+`
	`110`	`+`
`105`	`111`	`## Using this core as an mbed library`
`106`	`112`
`107`	`113`	You can use this core as a standard mbed library; all APIs are under `arduino` namespace (so they must be called like `arduino::digitalWrite()` )

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