Add kl27z_onekey project initial files

keyboard/kl27z_onekey/README.md

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+KL27Z128/256 board
+==================
+2016/11/30
+
+KL27Z is configured to use internal 48MHz RC oscillator.
+
+The board has push button on PTA4 and LED on PTD7. The button works as 'a' key and the LED as an indicator for capslock.
+
+
+Resources
+---------
+### Kinetis KL2x
+http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/kinetis-cortex-m-mcus/l-series-ultra-low-power-m0-plus/kinetis-kl2x-48-mhz-usb-ultra-low-power-microcontrollers-based-on-arm-cortex-m0-plus:KL2x
+
+### KL27Z128/256 Data Sheet
+http://www.nxp.com/assets/documents/data/en/data-sheets/KL27P64M48SF6.pdf
+
+### KL27Z128/256 Reference Manual
+http://www.nxp.com/assets/documents/data/en/reference-manuals/KL27P64M48SF6RM.pdf
+
+### Errata
+http://www.nxp.com/assets/documents/data/en/errata/KINETIS_L_1N71K.pdf
+
+>>
+e9457: Kinetis Flashloader/ ROM Bootloader: The peripheral auto-detect code in
+bootloader can falsely detect presence of SPI host causing non-responsive
+bootloader
+Description: During the active peripheral detection process, the bootloader can interpret spurious data on
+the SPI peripheral as valid data. The spurious data causes the bootloader to shutdown all
+peripherals except the “falsely detected" SPI and enter the command phase loop using the
+SPI. After the bootloader enters the command phase loop using the SPI, the other peripherals
+are ignored, so the desired peripheral is no longer active.
+The bootloader will not falsely detect activity on the I2C, UART, or USB interfaces, so only the
+SPI interface is affected.
+Workaround: Ensure that there is an external pull-up on the SPI chip-select pin or that the pin is driven high.
+This will prevent the bootloader from seeing spurious data due to activity on the SPI clock pin.
+
+### Kinetis Bootloader and blhost
+http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/kinetis-cortex-m-mcus/kinetis-symbols-footprints-and-models/kinetis-bootloader:KBOOT
+
+
+Build
+-----
+
+    make
+
+
+Program
+-------
+Flash firmware with ROM bootloader.
+
+    blhost -u -- flash-image  build/kl27z.hex erase
+
+
+TODO
+----
+- Fix boards/ELF files
+- add macro `USBx_CTL_RESUME` to ChibiOS-Contrib/os/common/ext/CMSIS/KINETIS/kl27zxxx.h