Add various badges to README

.github/workflows/lint.yml

@@ -1,6 +1,6 @@
 on: [push, pull_request]
   
-name: Rust Lint
+name: Lint
 
 jobs:
   clippy:

.github/workflows/test.yml

@@ -1,6 +1,6 @@
 on: [push, pull_request]
 
-name: Rust Tests
+name: Tests
 
 jobs:
   test:

README.md

@@ -3,6 +3,8 @@
 A pure-Rust crate for parsing Flattened Devicetrees, with the goal of having a
 very ergonomic and idiomatic API.
 
+[![crates.io](https://img.shields.io/crates/v/fdt.svg)](https://crates.io/crates/fdt) [![Documentation](https://docs.rs/fdt/badge.svg)](https://docs.rs/fdt) ![Build](https://github.com/repnop/fdt/actions/workflows/test.yml/badge.svg?branch=master&event=push)
+
 ## License
 
 This crate is licensed under the Mozilla Public License 2.0 (see the LICENSE file).