Add a clang format file #184

Job	Run time
Build application (nanos)	1m 10s
Build application (nanosp)	1m 14s
Build application (nanox)	1m 16s
Build application (stax)	1m 27s
build_docker_integration_tests / Build docker image	14s
build_docker_tezos_ocaml / Build docker image	23s
generate_samples_unit_tests	5m 22s
integration_tests_basic (nanos)	1m 49s
integration_tests_basic (nanosp)	1m 32s
integration_tests_basic (nanox)	2m 12s
integration_tests_basic (stax)	1m 21s
integration_tests_samples (nanos, micheline)	19m 49s
integration_tests_samples (nanos, operations)	27m 18s
integration_tests_samples (nanosp, micheline)	20m 37s
integration_tests_samples (nanosp, operations)	34m 10s
integration_tests_samples (nanox, micheline)	18m 29s
integration_tests_samples (nanox, operations)	25m 3s
	2h 43m 26s

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