Adiciona info doxygen em gradSolver.c

Signed-off-by: Aryane Ast dos Santos <aryaneast@gmail.com>
Adiciona Makefile

Signed-off-by: Aryane Ast dos Santos <aryaneast@gmail.com>
Adiciona .gitignore

Signed-off-by: Aryane Ast dos Santos <aryaneast@gmail.com>