Cleaning repo

CMakeLists.txt

demos/helmholtz/scattering/pml/main.cpp

demos/helmholtz/scattering/testWithoutGInPML/main.cpp

demos/helmholtzflow/freefield/runTests.sh

demos/navier/scattering/CMakeLists.txt

examples/.clang-format

examples/CMakeLists.txt

examples/README.md

examples/README_template.md

examples/example.cmake

examples/helmholtz/checkerboard_bcgs/CMakeLists.txt

examples/helmholtz/checkerboard_bcgs/conv_test.txt

examples/helmholtz/checkerboard_bcgs/main.cpp

examples/helmholtz/scattering/planeWaveDisk/CMakeLists.txt

examples/helmholtz/scattering/planeWaveDisk/main.cpp

examples/helmholtzflow/freefield/CMakeLists.txt

examples/helmholtzflow/freefield/main.cpp

examples/helmholtzflow/freefield/runTests.sh

examples/helmholtzflow/waveguide/CMakeLists.txt

examples/helmholtzflow/waveguide/main.cpp