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, 45 insertions, 0 deletions

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+# STM32F103 Bluepill RTIC Blink example
+
+Working example of simple LED blinking application for popular Bluepill boards based on the STM32F103C8 chip. Example uses schedule API and peripherials access. You will need `stlink v2` tool or other programmer to flash the board.
+
+## How-to
+
+### Terminal workflow
+
+Rust embedded relies heavily on `terminal workflow`, you will enter commands in the terminal. This can be strange at first, but this enables usage of great things like continious integration tools.
+
+For Mac OS X consider using `iTerm2` instead of Terminal application.
+For Windows consider using `powershell` (win + r -> powershell -> enter -> cd examples\stm3f1_bluepill_blinky)
+
+### Build
+
+Run `cargo build` to compile the code. If you run it for the first time, it will take some time to download and compile dependencies. After that, you will see comething like:
+
+```shell
+$ cargo build
+Finished dev [optimized + debuginfo] target(s) in 0.10s
+```
+
+If you see warnings, feel free to ask for help in chat or issues of this repo.
+
+### Connect the board
+
+You need to connect you bluepill board to ST-Link and connect pins:
+
+| BOARD |    | ST-LINK |
+|-------|----|---------|
+| GND   | -> | GND     |
+| 3.3V  | -> | 3.3V    |
+| SWCLK | -> | SWCLK   |
+| SWDIO | -> | SWDIO   |
+
+Plug in ST-Link to USB port and wait it to initialize.
+
+### Flashing and running
+
+Install `cargo embed` from probe-rs tools by following the instructions at https://probe.rs/docs/getting-started/installation/.
+Flashing with a standard STLink v2 is easy with `cargo-embed`:
+
+```shell
+$ cargo embed --release
+```