added cmods folder

cmods/.gitignore

cmods/CPU_check.cpp

cmods/GPU_check.cu

cmods/Makefile

cmods/README.md

cmods/STL_particles.cpp

cmods/app.js

cmods/bonds_GL.cpp

cmods/bonds_stress_strain.cu

cmods/file/bonds_stress_strain.cpp

cmods/file/bonds_stress_strain_peer.cu

cmods/file/particles_stress_strain.cu

cmods/numbers.md

cmods/particles_GL.cpp

cmods/particles_STL.cpp

cmods/particles_bonds.cu

cmods/pipe_check.cpp

cmods/strain_GL.cpp

cmods/strain_plot.py