add descriptor calc

Author: dreadlesss

Diff for: README.md

@@ -26,4 +26,7 @@ rdkit总结与记录
 **MCS.ipynb**
 
 ## 各类分子指纹、相似性度量、多样化分子库构建
-**FP_similarity_and_application.ipynb**
+**FP_similarity_and_application.ipynb**
+
+## 分子描述符计算与可视化
+**descriptor_calculate_visualize.ipynb**