add binary-sv2 no-serde codec readme

protocols/v2/binary-sv2/no-serde-sv2/codec/README.md

@@ -1,3 +1,44 @@
 # binary_codec_sv2
 
-`binary_codec_sv2` is a Rust `no_std` crate
+[![crates.io](https://img.shields.io/crates/v/binary_codec_sv2.svg)](https://crates.io/crates/binary_codec_sv2)  
+[![docs.rs](https://docs.rs/binary_codec_sv2/badge.svg)](https://docs.rs/binary_codec_sv2)  
+[![rustc+](https://img.shields.io/badge/rustc-1.75.0%2B-lightgrey.svg)](https://blog.rust-lang.org/2023/12/28/Rust-1.75.0.html)  
+[![license](https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg)](https://github.com/stratum-mining/stratum/blob/main/LICENSE.md)
+[![codecov](https://codecov.io/gh/stratum-mining/stratum/branch/main/graph/badge.svg?flag=binary_codec_sv2-coverage)](https://codecov.io/gh/stratum-mining/stratum)  
+
+`binary_codec_sv2` is a `no_std` Rust crate that helps serialize and de-serialize binary data into and from Stratum V2 types.
+
+## Key Features
+
+- **Comprehensive Encoding and Decoding**: Provides traits (`Encodable`, `Decodable`) for converting between Rust and SV2 data types/structures.  
+- **Support for Complex Data Structures**: Handles primitives, nested structures, and protocol-specific types like `U24`, `U256`,`Str0255` and rest.  
+- **Error Handling**: Robust mechanisms for managing encoding/decoding failures, including size mismatches and invalid data.  
+- **Cross-Language Compatibility**: Utilities like `CVec` and `CError` ensure smooth integration with other programming languages.  
+- **`no_std` Compatibility**: Fully supports constrained environments without the Rust standard library.  
+
+## Sv2 Type Mapping
+
+The crate supports the following mappings between Rust and SV2 types
+
+| Rust Type   | Sv2 Type       |  
+|-------------|----------------|  
+| `bool`      | `BOOL`         |  
+| `u8`        | `U8`           |  
+| `u16`       | `U16`          |  
+| `U24`       | `U24`          |  
+| `u32`       | `U32`          |  
+| `u64`       | `U64`          |  
+| `f32`       | `F32`          |  
+| `Str0255`   | `STRO_255`     |  
+| `Signature` | `SIGNATURE`    |  
+| `[u8]`      | `BYTES`        |  
+| `Seq0255`   | `SEQ0_255[T]`  |  
+| `Seq064K`   | `SEQ0_64K[T]`  | 
+
+## Installation
+
+Add `binary_codec_sv2` to your project by running:
+
+```sh
+cargo add binary_codec_sv2
+```