Add docs for running the src executables

Author: connoraird

CMakeLists.txt

@@ -8,7 +8,8 @@ project(
   DESCRIPTION "Fortran tooling"
 )
 
-set(CMAKE_Fortran_FLAGS "-ffree-line-length-none")
+set(GFORTRANFLAGS "-ffree-line-length-none")
+set(CMAKE_Fortran_FLAGS "${GFORTRAN_FLAGS}") # Update this to match the flags for the chosen compiler
 
 # Define src files
 set(PROJ_SRC_DIR "${PROJECT_SOURCE_DIR}/src")

README.md

@@ -44,3 +44,17 @@ cd build
 make
 ```
 This will produce executables for the two src codes, `fortran-tooling-mesh-generator` and `fortran-tooling-poisson`.
+
+## Running the src
+
+### Mesh generator
+
+```sh
+./build/fortran-tooling-mesh-generator <box_size> <edge_size>
+```
+
+### Poisson solver
+
+```sh
+./build/fortran-tooling-poisson # then respond to prompt with the mesh name, likely to be `square_mesh`
+```