add more atmel studio framework code

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diff --git a/watch-library/hal/documentation/spi_master_sync.rst b/watch-library/hal/documentation/spi_master_sync.rst
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+The SPI Master Synchronous Driver
+=================================
+
+The serial peripheral interface (SPI) is a synchronous serial communication
+interface.
+
+SPI devices communicate in full duplex mode using a master-slave
+architecture with a single master. The master device originates the frame for
+reading and writing. Multiple slave devices are supported through selection
+with individual slave select (SS) lines.
+
+Features
+--------
+
+* Initialization/de-initialization
+* Enabling/disabling
+* Control of the following settings:
+
+  * Baudrate
+  * SPI mode
+  * Character size
+  * Data order
+* Data transfer: transmission, reception and full-duplex
+
+Applications
+------------
+
+Send/receive/exchange data with a SPI slave device. E.g., serial flash, SD card,
+LCD controller, etc.
+
+Dependencies
+------------
+
+SPI master capable hardware
+
+Concurrency
+-----------
+
+N/A
+
+Limitations
+-----------
+
+The slave select (SS) is not automatically inserted during read/write/transfer,
+user must use I/O to control the devices' SS.
+
+Known issues and workarounds
+----------------------------
+
+N/A
+