Update .gitmodules

.gitmodules

 [submodule "src/pinnedVector"]
 	path = src/pinnedVector
 	url = https://github.com/meemknight/pinnedVector.git
+[submodule "src/itlib"]
+	path = src/itlib
+	url = https://github.com/iboB/itlib.git
+[submodule "src/eigen"]
+	path = src/eigen
+	url = ../eigen.git