Add examples

What's Changed

• Add examples/basic/formatting/format_bit.go by @devlights in #798
• Add examples/basic/ioop/teeread.go by @devlights in #799
• Add examples/basic/ioop/sectionread.go by @devlights in #800
• Add examples/basic/ioop/offsetwrite.go by @devlights in #801
• Add examples/singleapp/replace_timenow_with_golinkname_directive example by @devlights in #802

Full Changelog: v0.5.19...v0.5.20