Add examples

What's Changed

• Add result in examples by @devlights in #768
• Add result in examples by @devlights in #769
• Add examples/basic/strs/trimspace.go by @devlights in #770
• Add examples/singleapp/future_promise by @devlights in #771
• Add examples/basic/times/time_format_millisecond.go by @devlights in #772
• Add examples/basic/times/time_format_microsecond.go by @devlights in #773
• Add examples/basic/syncs/mutex_trylock.go by @devlights in #774
• Add result in examples by @devlights in #775
• Add examples/basic/syncs/use_rwmutex.go by @devlights in #776
• Add examples/basic/syncs/rwmutex_trylock.go by @devlights in #777

Full Changelog: v0.5.16...v0.5.17