Added directory tree with indented descriptions

README.md

 # Scripts for simulating wide-field-of-view satellite measurements of top-of-atmosphere radiation fields
 
-
 ## Overview
 These scripts form the basis of the analysis in "Sampling the diurnal and annual cycles of the Earth’s energy
 imbalance with constellations of satellite-borne radiometers" by Hocking et al., 2024.
@@ -20,6 +19,23 @@ The processing also requires an installation of the Climate Data Operators (CDO)
 Python
 
 ## File description
+```
+.
+├── README.md                                This document
+├── environment.yml                          Python environment specifications
+├── bin_satm_to_toagrid.py                   Process satellite measurements by binning them on a chosen grid
+├── earth.py                                 Main script containing Earth class, for framework of the radiation fluxes
+├── measure_file_to_nc_sgp4sat.py            Measure radiation from input file and save measurements to output file
+├── process_satm_to_gridweights.py           Process satellite measurements to determine gridded distribution
+├── satellite.py                             Main script containing satellite classes, for framework of measurement of Earth instances
+├── smooth_file_with_satellite_footprint.py  Compute the convolution of the input file with the satellite footprint
+├── split_CERES_files.py                     Convenience script for preparing input data files
+├── unitsconstants.py                        Collection of units and constants
+├── ceres_reference                          Directory with scripts to create CERES reference files, which are used in the processing of satellite measurements
+├── diurnalcycle                             Directory with script to restructure input file in terms of local solar time, instead of e.g. GMT
+└── experiment                               Directory with scripts to compute the measurements for a set of satellites.
+```
+
 - `./README.md` - This document.
 - `./environment.yml` - Python environment specifications.
 - `./bin_satm_to_toagrid.py` - Process satellite measurements by binning them on a chosen grid.