Update README.md

Author: P1umer

utils/aflpp_extractor/README.md

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 # AFL++ Plugin: Data-Generator Extractor
-## Overview
 This plugin allows AFL++ to use LibFuzzer's data generators for fuzzing. The plugin extracts generators from LibFuzzer and integrates them into AFL++.
+## Motivation
+![img](img/motivation.jpg)
+
+The primary motivation behind this plugin is to enhance the fuzzing capabilities of AFL++ by utilizing the powerful data generators present in specific LibFuzzers. These data generators can construct complex inputs that meet certain structures, syntax, or semantics, making AFL++ more effective when testing PEER applications. This idea is inspired by a saying from the Chinese classic "Book of Songs" (诗经): "The stones from other hills can be used to polish jade" (他山之石, 可以攻玉), emphasizing the value of learning from others to improve oneself.
 
 ## Example Building