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Merge pull request #4321 from mysterywolf/blue

[stm32][bluepill] 增加英文参考资料
Bernard Xiong %!s(int64=4) %!d(string=hai) anos
pai
achega
09024c25f0

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bsp/stm32/stm32f103-blue-pill/README.pdf


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bsp/stm32/stm32f103-blue-pill/documents/Beginning STM32 (excerpt).pdf