Add examples

What's Changed

• Add-duck-typing-example by @devlights in #548
• Fmt-sources by @devlights in #549
• Add-zip-example by @devlights in #550
• Add time_truncate_hours.go by @devlights in #551
• Add archive/tar example by @devlights in #552
• add read_one_input.go by @devlights in #553
• Add read_multiple_input.go by @devlights in #554
• Add pprof_thread_count example by @devlights in #555
• Add examples/singleapp/web/superbasic by @devlights in #556
• Add examples/advanced/structtag/tagget.go by @devlights in #557
• Add examples.singleapp/list_go_archs by @devlights in #558
• Add examples to examples/basic/scannerop by @devlights in #559
• Add slice header is not thread-safe example by @devlights in #560
• Add map_is_not_threadsafe example by @devlights in #561
• Add examples/gocollective/retrieve-values-from-url by @devlights in #562
• Add http.Server shutdown example by @devlights in #563
• Add gocollective example by @devlights in #564

Full Changelog: v0.4.2...v0.4.3