Add security.md file to the repo #1477

Job	Run time
build	2m 50s
tests (//base/javacontainer/test:ExaStackTraceCleanerTest, ExaStackTraceCleanerTest)	2m 58s
tests (//base/javacontainer/test:javacontainer-test-extractor-legacy, javacontainer-test-extracto...	1m 46s
tests (//base/javacontainer/test:javacontainer-test-extractor-v2, javacontainer-test-extractor-v2)	3m 0s
tests (//base/javacontainer/script_options/..., javacontainer-script_options)	1m 7s
tests (//base/exaudflib/test/..., exaudflib)	1m 7s
tests (//base/script_options_parser/ctpg/..., script_options_parser_ctpg)	2m 10s
tests (//base/script_options_parser/legacy/..., script_options_parser_legacy)	55s
tests (--run_under='valgrind --leak-check=yes' --config=valgrind //base/javacontainer/test:javaco...	1m 22s
tests (--run_under='valgrind --leak-check=yes' --config=valgrind //base/javacontainer/test:javaco...	1m 37s
tests (--run_under='valgrind --leak-check=yes' --config=valgrind //base/script_options_parser/ctp...	2m 21s
tests (--run_under='valgrind --leak-check=yes' --config=valgrind //base/script_options_parser/leg...	1m 27s
tests (--config=asan //base/javacontainer/test:javacontainer-test-extractor-legacy, javacontainer...	1m 25s
tests (--config=asan //base/javacontainer/test:javacontainer-test-extractor-v2, javacontainer-tes...	4m 25s
tests (--config=asan //base/script_options_parser/ctpg/..., script_options_parser_ctpg_with_asan)	2m 7s
tests (--config=asan //base/script_options_parser/legacy/..., script_options_parser_legacy_with_a...	1m 21s
	31m 58s

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