Add README

Author: dylanmckay

README.md

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+# avr-std-stub
+
+[![Crates.io](https://img.shields.io/crates/v/avr-std-stub.svg)](https://crates.io/crates/avr-std-stub)
+[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
+
+[API Documentation](https://docs.rs/avr-std-stub)
+
+Contains simple implementations of required language items that `libstd` normally defines on other targets.
+
+This fixes the following error when compiling for Rust:
+
+```
+error: `#[panic_handler]` function required, but not found
+
+error: language item required, but not found: `eh_personality`
+
+error: aborting due to 2 previous errors
+```
+