Add example for STM32F411 with HW & SW tasks communicating via MPSC c…

…hannel (#953)

* Add example with HW & SW tasks communicating via MPSC channel

* example: f411-adc-mpcsc: nit: typos

* example: f411-adc-mpsc: prefer text over picture

---------

Co-authored-by: Milton Eduardo Sosa <milton@Miltons-MacBook-Pro.local>
Co-authored-by: Henrik Tjäder <henrik@tjaders.com>

examples/stm32f411_adc_and_mpsc_channel/.cargo/config.toml

@@ -0,0 +1,14 @@
+[target.thumbv7em-none-eabihf]
+
+runner = "probe-rs run --chip STM32F411CEUx"
+
+rustflags = [
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
+]
+
+[build]
+target = "thumbv7em-none-eabihf"
+
+[env]
+DEFMT_LOG = "debug"