Add todo to readme

README.md

@@ -2,6 +2,9 @@
 
 pyTurbulence is a Python package for generating synthetic compressible turbulent fields for Direct Numerical Simulation (DNS) based on the method of Ristorcelli and Blaisdell. This package provides tools to generate velocity, pressure, and thermodynamic fields, as well as to compute and plot the energy spectrum of the generated turbulence.
 
+TODO:
+    - add dilatational velocity fluctuations
+
 ## Features
 
 - Generate solenoidal velocity fields using the method of Rogallo.

pyproject.toml

@@ -16,7 +16,7 @@ requires-python = ">=3.6"
 dependencies = [
     "numpy>=1.21",      # Required for numerical computations
     "numba>=0.56",      # For JIT optimization
-    "pytest>=7.0"       # For testing
+    "pytest>=7.0",      # For testing
     "matplotlib>=3.4"   # For plotting
 ]