add TOC and first example

Author: JuliDi

README.md

@@ -2,3 +2,16 @@
 [![Awesome](https://awesome.re/badge.svg)](https://awesome.re)
 
 Curated list of tools and resources for testing Embedded and Low-level software
+
+## Table of Contents
+- [Embedded Testing](#embedded-testing)
+  - [Table of Contents](#table-of-contents)
+  - [Books, blogs and training materials](#books-blogs-and-training-materials)
+  - [Test Frameworks](#test-frameworks)
+    - [Rust Test Frameworks](#rust-test-frameworks)
+
+## Books, blogs and training materials
+
+## Test Frameworks
+### Rust Test Frameworks
+- https://crates.io/crates/embedded-test **Rust** test harness and runner for embedded devices [![crates.io](https://img.shields.io/crates/v/embedded-test.svg)](https://crates.io/crates/embedded-test)