Update README.md

README.md

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-Edit this `README.md` markdown file to author your organization card 🔥
+# Xi'an Jiaotong Univerisity 🏛️
+
+<img src="https://vi.xjtu.edu.cn/images/a4-7sbzh.png" width="500" height="500" />
+
+This is an unofficial organization of [Xi'an Jiaotong University](http://en.xjtu.edu.cn/), and all interested parties are welcome to join😊.