documenting the use of the side drawer

[sombriks]

trafficstars

this is my first pr, i decided to document it because the way the nativescript vue playground uses it isn't covered yet.

i am willing to expand the docs by hearing what more would be nice to tell to beginners (like me) on what can be done with this drawer.

please provide feedback and, if valuable, merge this into the main docs.

[nativescript-vue-bot]

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