Created Board NUCLEO-F401RE (markdown)

Board-NUCLEO-F401RE.md

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+Cortex M4 STM32F401RE
+* on STM site - http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/LN1847/PF260000?icmp=nucleo-ipf_pron_pr-nucleo_feb2014&sc=nucleoF401RE-pr
+
+###Features###
+* STM32F401RE 168MHz (64pin)
+* 512KB flashROM, 64KB RAM
+* 1 LED
+* 1 Switch
+
+###Status###
+Preliminary support is in https://github.com/nuraci/micropython Untested.
+
+###The STM32F401RE Board:###
+![](http://www.st.com/st-web-ui/static/active/en/fragment/product_related/rpn_information/board_photo/nucleo-F4.jpg)