embassy-embedded-hal: add README.

embassy-embedded-hal/README.md

@@ -0,0 +1,12 @@
+# embassy-embedded-hal
+
+Collection of utilities to use `embedded-hal` and `embedded-storage` traits with Embassy.
+
+- Shared SPI and I2C buses, both blocking and async, with a `SetConfig` trait allowing changing bus configuration (e.g. frequency) between devices on the same bus.
+- Async utilities
+    - Adapters to convert from blocking to (fake) async.
+    - Adapters to insert yields on trait operations.
+- Flash utilities
+    - Split a flash memory into smaller partitions.
+    - Concatenate flash memories together.
+    - Simulated in-memory flash.

embassy-embedded-hal/src/lib.rs

@@ -1,8 +1,7 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 #![allow(async_fn_in_trait)]
 #![warn(missing_docs)]
-
-//! Utilities to use `embedded-hal` traits with Embassy.
+#![doc = include_str!("../README.md")]
 
 pub mod adapter;
 pub mod flash;