Migration to github: Added git submodules.

Signed-off-by: Franz R. Sattler <[email protected]>

.gitmodules

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+[submodule "external/autodiff"]
+	path = external/autodiff
+	url = https://github.com/autodiff/autodiff.git
+[submodule "external/sundials"]
+	path = external/sundials
+	url = https://github.com/LLNL/sundials.git
+[submodule "external/Catch2"]
+	path = external/Catch2
+	url = https://github.com/catchorg/Catch2.git
+[submodule "external/rapidcsv"]
+	path = external/rapidcsv
+	url = https://github.com/d99kris/rapidcsv.git
+[submodule "external/kokkos"]
+	path = external/kokkos
+	url = https://github.com/kokkos/kokkos.git
+[submodule "external/rmm"]
+	path = external/rmm
+	url = https://github.com/rapidsai/rmm.git
+[submodule "external/dealii"]
+	path = external/dealii
+	url = https://github.com/dealii/dealii.git
+[submodule "external/boost"]
+	path = external/boost
+	url = https://github.com/boostorg/boost.git
+[submodule "external/spdlog"]
+	path = external/spdlog
+	url = https://github.com/gabime/spdlog.git
+[submodule "external/eigen"]
+	path = external/eigen
+	url = https://gitlab.com/libeigen/eigen
+[submodule "external/qmc"]
+	path = external/qmc
+	url = https://github.com/mppmu/qmc.git
+[submodule "external/thread-pool"]
+	path = external/thread-pool
+	url = https://github.com/bshoshany/thread-pool.git