Added Chart.js files

Signed-off-by: Bjørn Johansen <post@bjornjohansen.no>
Updated read me with ACF and Repeater Field requirement

Signed-off-by: Bjørn Johansen <post@bjornjohansen.no>
Added ACF XML export

Signed-off-by: Bjørn Johansen <post@bjornjohansen.no>
Enqueueing Chart.js and added ACF code

Signed-off-by: Bjørn Johansen <post@bjornjohansen.no>