Update README.md

Added note about no longer being maintained

Author: Xerrion

README.md

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 ![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/xerrion/shr_parser_py/CI.yml) ![GitHub License](https://img.shields.io/github/license/xerrion/shr_parser_py) ![Crates.io Version](https://img.shields.io/crates/v/shr_parser_py?link=https%3A%2F%2Fcrates.io%2Fcrates%2Fshr_parser_py)
 
+# NOTE: No longer actively maintained, if anyone want to take over please contact me. Will probably be archived at some point.
+
 # SHR Parser Python Bindings
 
 This project provides Python bindings for the Rust-based `shr_parser` library, which is designed to parse and handle SHR files. The SHR file format includes a file header and multiple sweeps, each with its own header and data. This library uses memory mapping for efficient file reading and Rayon for parallel processing of sweeps.