docs: Add TypeScript to getting started page

[fhildeb]

What kind of change does this PR introduce?

Update the docs

What is the current behavior?

Currently throwing errors for TS users that are unaware of built-in types.

What is the new behavior?

They instantiate their schemas with the ERC725JSONSchema[] type.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (afd6885) 82.86% compared to head (e5bfe3e) 82.13%.
Report is 11 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #379      +/-   ##
===========================================
- Coverage    82.86%   82.13%   -0.73%     
===========================================
  Files           19       19              
  Lines         1243     1282      +39     
  Branches       286      298      +12     
===========================================
+ Hits          1030     1053      +23     
- Misses         115      126      +11     
- Partials        98      103       +5     

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[richtera]

Probably not a big deal, but taking editing typecript for someone looking for plain javascript might not be awesome.

[CJ42]

I would suggest actually to not go with this change in the docs and instead fix the typing at the schema levels.

Ideally, the schemas should be exported from an index.ts file under the schema/ folder, and have the right typing assigned to them, as:

export const LSP6Schema: ERC725JSONSchema[] = [
    {
        // schema here
    },
    // more objects
]

[richtera]

But aren't the schemas usually in json files? Making them ts would be better for sure

[fhildeb]

Added all suggestions from above. Do you think this is ready to go now? @CJ42 @Hugoo

[Hugoo]

this is weird

[Hugoo]

I don't understand why we should duplicate the whole code snippet
just to explain that ppl can use : ERC725JSONSchema[]

I would reco to keep only one code snippet and put a comment just where needed

// Typescript type: : ERC725JSONSchema[]

or smtgh

Just to let ppl super easily spot the difference and to have less stuff to maintain