dataset for enrichmet tutorial

To run the enrichmet function, at least two input files are required. The files chemical-chemical.tsv, kegg_lookup.xlsx, and mapping_df.xlsx are optional and can be included to enhance the analysis.若需运行该富集分析函数，至少需提供两个输入文件。文件chemical-chemical.tsv、kegg_lookup.xlsx及mapping_df.xlsx为可选文件，添加此类文件可优化分析效果。