[DOC] add paper logo

README.md

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 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/ablkit)](https://pypi.org/project/ablkit/) [![PyPI version](https://badgen.net/pypi/v/ablkit)](https://pypi.org/project/ablkit/) [![Documentation Status](https://readthedocs.org/projects/ablkit/badge/?version=latest)](https://ablkit.readthedocs.io/en/latest/?badge=latest) [![license](https://img.shields.io/github/license/mashape/apistatus.svg?maxAge=2592000)](https://github.com/AbductiveLearning/ABLkit/blob/main/LICENSE) [![flake8 Lint](https://github.com/AbductiveLearning/ABLkit/actions/workflows/lint.yaml/badge.svg)](https://github.com/AbductiveLearning/ABLkit/actions/workflows/lint.yaml) [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black) [![ABLkit-CI](https://github.com/AbductiveLearning/ABLkit/actions/workflows/build-and-test.yaml/badge.svg)](https://github.com/AbductiveLearning/ABLkit/actions/workflows/build-and-test.yaml)
 
-[📘Documentation](https://ablkit.readthedocs.io/en/latest/index.html) | [📚Examples](https://github.com/AbductiveLearning/ABLkit/tree/main/examples) | [💬Reporting Issues](https://github.com/AbductiveLearning/ABLkit/issues/new)
+[📘Documentation](https://ablkit.readthedocs.io/en/latest/index.html) | [📄Paper](https://journal.hep.com.cn/fcs/EN/10.1007/s11704-024-40085-7) | [📚Examples](https://github.com/AbductiveLearning/ABLkit/tree/main/examples) | [💬Reporting Issues](https://github.com/AbductiveLearning/ABLkit/issues/new)
 
 </div>
 
 # ABLkit: A Toolkit for Abductive Learning
 
-- [Documentation](https://ablkit.readthedocs.io/en/latest/index.html)
-- [Read the paper](https://journal.hep.com.cn/fcs/EN/10.1007/s11704-024-40085-7)
-
 **ABLkit** is an efficient Python toolkit for [**Abductive Learning (ABL)**](https://www.lamda.nju.edu.cn/publication/chap_ABL.pdf). ABL is a novel paradigm that integrates machine learning and logical reasoning in a unified framework. It is suitable for tasks where both data and (logical) domain knowledge are available. 
 
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