Update README.md

code/README.md

-# DATA OBTENTION 
+# CODE AND ANALYSIS
 
-## Code
+## Repository content
 
 | Script name                                                                                                                                                                                          | Usage                       |
 |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------|
 | [scrna_ppi_analysis.ipynb](https://medal.ctb.upm.es/internal/gitlab/disnet/network-medicine/network-medicine-and-single-cell-for-alzheimer/new/master/code/scrna_ppi_analysis.ipynb) | Jupyter notebook used to load the h5ad data, perform the data preprocessing, the differential expression analysis and the construction of the cell-type-specific PPI subnetworks overlapping the Alzheimer's disease main disease module. In addition, subsequent analysis and plots generation were computed.|
 
 
-## Functions folder
+### Functions folder
 
 | Script name                                                                                                                                                                                                | Used in:                                                                                                                                                                                             |   Usage      |
 |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------|