DOC add asv badge in readme (#145)

Author: MatthewSZhang

README.rst

@@ -1,6 +1,6 @@
 fastcan: A fast canonical-correlation-based greedy search algorithm
 ===================================================================
-|conda| |Codecov| |CI| |Doc| |PythonVersion| |PyPi| |ruff| |pixi|
+|conda| |Codecov| |CI| |Doc| |PythonVersion| |PyPi| |ruff| |pixi| |asv|
 
 .. |conda| image:: https://img.shields.io/conda/vn/conda-forge/fastcan.svg
    :target: https://anaconda.org/conda-forge/fastcan
@@ -26,6 +26,9 @@ fastcan: A fast canonical-correlation-based greedy search algorithm
 .. |pixi| image:: https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/prefix-dev/pixi/main/assets/badge/v0.json&style=flat-square
    :target: https://pixi.sh
 
+.. |asv| image:: https://img.shields.io/badge/benchmarked%20by-asv-blue.svg?style=flat
+   :target: http://contrib.scikit-learn.org/fastcan/
+
 fastcan is a greedy search algorithm that supports:
 
 #. Feature selection