Extend 'famous_for' Property to have categories and add/adjust methods

[sthiepaan]

As mentioned in #32 we decided to extend this package with:

• Categories for famous_for Property (thanks @jav7zaid for an idea!)
• All countries should contain all categories for that property (even if they don't have a value)
• Initial categories:
  • building
  • food
  • sport
• Each category is an string[] (array of strings)
• If category has no values it should be as as empty array
• For the project needs all properties (and values) have to be lowercase.

After refactoring, each Country {Object} should contain:

{
  "country": "poland",
  "capital": "warsaw",
  "currency": "zloty",
  "native_language": ["polish"],
  "phone_code": "+48",
  "flag": "https://flagpedia.net/data/flags/h80/pl.png",
  "drive_direction": "right",
  // REFACTORED DATA
  "famous_for": {
    "building": ["palace of culture and science", "wawel"],
    "food": ["pierogi", "potatoes"],
    "sport": ["ski jumping", "volleyball"],
    // ...
  }
}

After updating/adding data, then we need to refacator getCountriesByFamousFor(famousThing) Method to have two parameters ➡️ getCountriesByFamousFor(type, value) (e.g.: getCountriesByFamousFor("sport", "football")).

[jav7zaid]

@sthiepaan are you working on this?

[sthiepaan]

No, just create a separate issues, so we do not flood a single thread. You can grab it!

@bhatvikrant if all is clear and fine to you, could you assign @jav7zaid? 😉