add binary_sv2 readme

protocols/v2/binary-sv2/binary-sv2/README.md

@@ -0,0 +1,31 @@
+# binary-sv2
+
+[![crates.io](https://img.shields.io/crates/v/binary-sv2.svg)](https://crates.io/crates/binary-sv2)
+[![docs.rs](https://docs.rs/binary-sv2/badge.svg)](https://docs.rs/binary-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)
+
+`binary-sv2` is a Rust crate that mediates between two implementations of Sv2 (Stratum V2) protocol serialization and deserialization—either through `serde` or custom trait-based encoding. This flexibility makes it adaptable for use in environments that may not support `serde`.
+
+## Key Capabilities
+
+- **Dual Serialization Options**: Offers both `serde` and custom serialization/deserialization, configurable with feature flags.
+- **Protocol-Specific Types**: Supports fixed and dynamically-sized SV2 types.
+- **Optimized Memory Use**: Supports buffer pooling to enhance memory efficiency.
+
+## Features
+
+- **with_serde**: Enables `serde`-based encoding and decoding.
+- **core**: Activates non-`serde` implementations via `binary_codec_sv2` and `derive_codec_sv2`.
+- **prop_test**: Adds property testing support.
+- **with_buffer_pool**: Optimizes memory usage during serialization.
+
+## Usage
+
+To include this crate in your project, run:
+
+```sh
+cargo add binary-sv2
+```
+
+