30-implementin…

.gitmodules
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			[submodule "extra_packages/extra-materials"]
			path = extra_packages/extra-materials
			url = git@lsmssrv1.epfl.ch:akantu-extra-materials.git
			[submodule "extra_packages/igfem"]
			path = extra_packages/igfem
			url = git@lsmssrv1.epfl.ch:akantu-igfem.git
			[submodule "extra_packages/students-extra-package"]
			path = extra_packages/students-extra-package
			url = git@lsmssrv1.epfl.ch:students-extra-package.git
			[submodule "extra_packages/phase-field"]
			path = extra_packages/phase-field
			url = git@lsmssrv1.epfl.ch:akantu-phase-field.git
			[submodule "extra-packages/contact-alejandro"]
			path = extra_packages/contact-alejandro
			url = git@lsmssrv1.epfl.ch:akantu-contact-alejandro.git