Add countries package (#2918)
Add countries package (#2918)

* Add countries package

Add countries package: https://github.com/biter777/countries

Countries - ISO 3166 (ISO3166-1, ISO3166, Digit, Alpha-2, Alpha-3) countries codes and names (on eng and rus), ISO 4217 currency designators, ITU-T E.164 IDD calling phone codes, countries capitals, UN M.49 regions codes, IANA ccTLD countries domains, IOC/NOC and FIFA codes, VERY FAST, NO maps[], NO slices[], NO external links/files/data, NO interface{}, NO specific dependencies, Databases compatible, Emoji countries flags and currencies support, full support ISO-3166-1, ISO-4217, ITU-T E.164, Unicode CLDR and IANA ccTLD standarts.

Full support ISO-3166-1, ISO-4217, ITU-T E.164, Unicode CLDR and IANA ccTLD standarts.

* Update README.md

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