ST: Research adds examples that demos pthread and helloworld. v6.0.118 #3189

Job	Run time
utest-regression-blackbox-test	5m 3s
multiple-arch-aarch64	5m 38s
multiple-arch-armv7	5m 31s
cygwin64-cache	3m 0s
cygwin64	7m 40s
fast	1s
build-centos7	2m 16s
build-ubuntu16	1m 36s
build-cross-aarch64	2m 25s
build-cross-arm	2m 25s
build-ubuntu18	1m 33s
build-ubuntu20	1m 49s
coverage	2m 29s
multiple-arch-amd64	1m 24s
test-done	1s
	42m 51s

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