[ENH] add img in readme

README.md

@@ -21,16 +21,20 @@ 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. 
 
+![Abductive Learning](img/ABL.png)
+
 Key Features of ABL Kit:
 
 - **Great Flexibility**: Adaptable to various machine learning modules and logical reasoning components.
-- **User-Friendly**: Provide data, model, and KB, and get started with just a few lines of code.
+- **User-Friendly**: Provide **data**, <span style="color: blue;">**model**</span>, and <span style="color: green;">**KB**</span>, and get started with just a few lines of code.
 - **High-Performance**: Optimization for high accuracy and fast training speed.
 
 ABL Kit encapsulates advanced ABL techniques, providing users with
 an efficient and convenient toolkit to develop dual-driven ABL systems,
 which leverage the power of both data and knowledge.
 
+![Abductive Learning](img/ABLKit.png)
+
 ## Installation
 
 ### Install from PyPI