Updated README due to #17

[edison]

Added example on how to push events using .dataLayer() function.

[tractorcow]

Thanks for this @edison ; These docs would have saved me a lot of effort if they were available earlier!

[edison]

Hey @alinemorelli, I think merge would be helpful for some people, based on @tractorcow experience and myself. Just some lines of docs, no risk. 😉

[arfanliaqat]

@edison unfortunately i have similar story to @tractorcow, thats why i reached this issue, and approved it :thinking: ... although i've no write access to this repo to merge this change :shrug: but i also think it should be merged :+1:

[igmrrf]

Hello @alinemorelli