Added 60+ more currencies and update README

[custardcream98]

• Added all of the currencies the API provides
• Updated README (including GIF)

[custardcream98]

[custardcream98]

• This workflow now supports
  AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, FOK, GBP, GEL, GGP, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, IMP, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KID, KMF, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLL, SOS, SRD, SSP, STN, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TVD, TWD, TZS, UAH, UGX, USD, UYU, UZS, VES, VND, VUV, WST, XAF, XCD, XDR, XOF, XPF, YER, ZAR, and ZMW

[jeppestaerk]

@custardcream98 is icons/flags provided for all the added currencies?

[custardcream98]

@jeppestaerk nope 😢😢 I need some help on that part.
or if you think it's unnecessery, you can just close this PR. then I'll just get rid of all of the added ones.
It's on your call😄😄

[ellingtonjp]

@custardcream98 the flags are easy to get, it will just take a bit of time. They can be obtained for free here: https://www.flaticon.com/packs/countrys-flags

The README already credits the author, so no need to do anything there.

If you don't want to do it, I might do it at some point.