519: Update README to highlight `cortex-m` 0.6 vs 0.7 new feature r=korken89 a=jorgeig-space

This is just a general README update. I will open another PR for the rust-doc text in branch 0.5.x, in case there is a  new release of 0.5.x at some point.

Co-authored-by: Jorge Iglesias Garcia <44316552+jorgeig-space@users.noreply.github.com>
Co-authored-by: Jorgeig <jorge@jorgeig.com>
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@ -52,6 +52,16 @@ Formerly known as Real-Time For the Masses.
- Applications must be written using the 2018 edition.
### Crate `cortex-m` 0.6 vs 0.7 in RTIC 0.5.x
The crate `cortex-m` 0.7 started using trait `InterruptNumber` for interrupts instead of `Nr` from `bare-metal`. In order to preserve backwards compatibility, RTIC 0.5.x will keep using `cortex-m` 0.6 by default. `cortex-m` 0.7 can be enabled using the feature `cortex-m-7` and disabling default features:
```
cortex-m-rtic = { version = "0.5.8", default-features = false, features = ["cortex-m-7"] }
```
RTIC 0.6 already uses `cortex-m` 0.7 by default.
## [User documentation](https://rtic.rs) - [(Development version)](https://rtic.rs/dev)
## [API reference](https://rtic.rs/stable/api/)