Add currency symbols support in currency module

[rpp001]

currency: {
     code: 'USD',
     base: 10,
     exponent: 2,
}

currency: {
     code: 'USD',
     base: 10,
     exponent: 2,
    symbol:'$'
}

[phips-git]

You can display the symbol by using the toLocaleString number method with type currency as described here in the new documentation. It will display the symbol according to your provided currency code.