Add instructions for installation on Ubuntu. #369

Job	Run time
mpifort -- ubuntu-22.04 -- default multiply kernel -- 1 processes -- 1 threads	5m 13s
mpifort -- ubuntu-22.04 -- ompGemm_m multiply kernel -- 1 processes -- 1 threads	5m 59s
mpifort -- ubuntu-22.04 -- default multiply kernel -- 1 processes -- 2 threads	4m 56s
mpifort -- ubuntu-22.04 -- ompGemm_m multiply kernel -- 1 processes -- 2 threads	5m 11s
mpifort -- ubuntu-22.04 -- default multiply kernel -- 2 processes -- 1 threads	3m 42s
mpifort -- ubuntu-22.04 -- ompGemm_m multiply kernel -- 2 processes -- 1 threads	3m 18s
mpifort -- ubuntu-22.04 -- default multiply kernel -- 2 processes -- 2 threads	2m 59s
mpifort -- ubuntu-22.04 -- ompGemm_m multiply kernel -- 2 processes -- 2 threads	3m 17s
	34m 35s

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