update README.md.

Signed-off-by: 葛峻恺 <202115006@mail.sdu.edu.cn>

README.md

@@ -14,22 +14,33 @@ A PyTorch-based implementation of a source-independent full waveform inversion (
 📉 Support initial model or none, time-depth conversion, depth-time conversion, GSSI data conversion and other functions...
 
 
+### 📂 Project Structure
+
 GPR-SIDL-inv/
-│
+
 ├── dataset/                   # Training/testing data and synthetic datasets
 
 ├── field_data/                 # Network architectures
 
 ├── gprMax/                  # Data processing, waveform simulation, etc.
+
 ├── IMG/                # Training script
+
 ├── impulse/                 # Inversion / prediction script
+
 ├── log/       # Custom loss functions
+
 ├── Network/       # Custom loss functions
+
 ├── readgssi/                 # Inversion / prediction script
+
 ├── SAVE/       # Custom loss functions
+
 ├── time_result_csv/       # Custom loss functions
+
 ├── utils/       # Custom loss functions
 
+
 ├── 1_model_generator.py           # Randomly generate in files as needed to support forward modeling of gprMax in 3D media.
 ├── 2_forward_simulation.py        # Run the forward modeling program to generate A-scan results
 ├── 3_combine_dataset.py           # Filter all A-scan data and generate a dataset