Add Grid Layout example

[AleshaOleg]

CSS Grid Layout example, should be added to collection. caniuse.com, displays that 66.65% of available browsers to work with Grids worldwide.

[idmytro]

Is grid layout a methodology? Any methodology can use it

[AleshaOleg]

@cisar holy-grail-markup not limited only with methodologies. Also, it shows how to create holy-grail markup for example with Bootstrap 4 (which use flexboxes). So, here same situation. I mean, to create example with any of methodology with example of usage CSS Grid Layout.