fix README, add license tags

Signed-off-by: Dave Huseby <[email protected]>

Author: dhuseby

README.md

@@ -1,2 +1,25 @@
+[![](https://img.shields.io/badge/made%20by-Cryptid%20Technologies-gold.svg?style=flat-square)][CRYPTID]
+[![](https://img.shields.io/badge/project-provenance-purple.svg?style=flat-square)][PROVENANCE]
+[![](https://img.shields.io/badge/project-multiformats-blue.svg?style=flat-square)][MULTIFORMATS]
+![](https://github.com/cryptidtech/multitrait/actions/workflows/rust.yml/badge.svg)
+
 # Multitrait
-Helpful traits and functions common to multicodec types.
+
+This crate contains three helpful traits common to most/all multiformats
+objects:
+
+**`EncodeInto`**
+: Defines a single function for encoding a value into a `Vec<u8>`
+
+**`TryDecodeFrom`**
+: Defines a simple interface for fallibly decoding a value from a `&[u8]` while
+  tracking which bytes have been consumed.
+
+**`Null`**
+: Defines two functions for creating a "null" multiformats value and for
+  testing if a multiformats value is the null value. This allows for the 
+  definition of a "null" CID or a "null" VLAD or even a "null" Multisig.
+
+[CRYPTID]: https://cryptid.tech/
+[PROVENANCE]: https://github.com/cryptidtech/provenance-specifications/
+[MULTIFORMATS]: https://github.com/multiformats/multiformats/

src/enc_into.rs

@@ -1,3 +1,4 @@
+// SPDX-License-Idnetifier: Apache-2.0
 use unsigned_varint::{decode, encode};
 
 /// This trait encodes a numeric value into a compact varuint Vec<u8>

src/error.rs

@@ -1,3 +1,4 @@
+// SPDX-License-Idnetifier: Apache-2.0
 /// Errors generated by the numeric type impls
 #[derive(Clone, Debug, thiserror::Error)]
 #[non_exhaustive]

src/lib.rs

@@ -1,3 +1,4 @@
+// SPDX-License-Idnetifier: Apache-2.0
 //! # Multiutil
 //!
 //! A set of traits that are helpful for implementing

src/null.rs

@@ -1,3 +1,4 @@
+// SPDX-License-Idnetifier: Apache-2.0
 /// This trait is for multiformat objects that have a NULL value
 pub trait Null {
     /// return an instance of Self where is_null(&self) -> true

src/try_decode_from.rs

@@ -1,3 +1,4 @@
+// SPDX-License-Idnetifier: Apache-2.0
 use crate::Error;
 use unsigned_varint::decode;