Added a note of next potential steps

Pipe1D.cs

@@ -183,3 +183,28 @@ namespace FluidSimV2
 
     }
 }
+
+/*
+Next potential steps:
+
+Implement a flux method (Lax Friedrichs)
+
+Dont update ghost cells in UpdateDerivedValues and UpdateCells
+
+Ghost cells boundary conditions
+
+Scrap the arrays _u, _P, _c - instead, compute on the fly (half memory traffic)
+
+Consider System.Runtime.Intrinsics for finer SIMD tuning
+
+Fuse UpdateDerivedValues and UpdateCells
+
+CFL based sub-stepping
+
+Vectorise the flux calculation
+
+Process multiple components together (SIMD - complicated)
+
+Potential multithreading of the SIMD loops
+
+*/