Currency support for LKR

[Chevindu]

Hi, I came across this app today and gave it a go. However it doesn't seem to support LKR (Sri Lankan Rupees) as a currency (using v2.16.0 release from Play Store). Is it possible to support LKR as a currency? Happy to contribute in ways I can. Thanks.

[sarim2000]

Yes, will add

[Chevindu]

Hi, I actually tried to give this one a go. Can you please have a look at #579 ? Thanks!