init basic examples and setup

examples/README.md

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+# Examples
+
+Each example is its own Cargo package.
+
+## Packages
+
+- `blinky-basic` - simple delay, simple LED ownership story
+- `blinky-timer` - periodic blink with a timer abstraction
+- `button-input` - poll `PA0`, mirror state to `PC13`, log transitions
+- `embassy-blinky` - minimal Embassy executor and async blink
+- `embassy-button` - minimal Embassy polling loop for `PA0`
+
+## Build One Example
+
+```bash
+just build-blinky
+just build-timer
+just build-button
+just build-embassy-blinky
+just build-embassy-button
+```
+
+## Flash One Example
+
+```bash
+just flash-blinky
+just flash-timer
+just flash-button
+just flash-embassy-blinky
+just flash-embassy-button
+```
+
+## Run With Logs
+
+```bash
+just run-blinky
+just run-embassy-blinky
+```