README.md update

README.md

 # Multiphysics 0471 
 
-Multiphysics Integrated Computational Project
+Multiphysics Integrated Computational Project
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+
+FOR WINDOWS: 
+
+To build the FEM solver:
+- go to the srcs/FEM folder (cd srcs/FEM)
+- create a build folder (mkdir build)
+- go to this build folder (cd build)
+- cmake ..
+- make
+
+To execute the FEM solver:
+- stay in the build folder and solver.exe ..\my_geo.geo
+- for simple tension configuration: solver.exe ..\simple_tension.geo
+- for second validation configuration: solver.exe ..\uniform_charge.geo
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