Add blinky example for STM32F1 bluepill board (#1007)

Code taken from stm32f3_blinky example with LED port adapted to bluepill
board.
Port initialization and README from v1 rtic-examples with slight edits.

1 files changed, 483 insertions, 0 deletions

diff --git a/examples/stm32f1_bluepill_blinky/Cargo.lock b/examples/stm32f1_bluepill_blinky/Cargo.lock
new file mode 100644
index 0000000..8e083b0
--- /dev/null
+++ b/examples/stm32f1_bluepill_blinky/Cargo.lock
@@ -0,0 +1,483 @@
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