We had developed a template <https://github.com/Ko...

# kontributors

[ilya.gorbunov]

We had developed a template https://github.com/Kotlin/KEEP/blob/master/proposals/stdlib/TEMPLATE.md for these stdlib proposals and supplied two proposals derived from this template as an example:
https://github.com/Kotlin/KEEP/blob/master/proposals/stdlib/window-sliding.md
https://github.com/Kotlin/KEEP/blob/master/proposals/stdlib/map-copying.md