Write and read json file

[jd-foster]

julia> using YFinance, JSON3
julia> aapl_json=get_quoteSummary("AAPL")

julia> open("aapl.json", "w") do f
            JSON3.write(f, aapl_json)
       end

julia> aapl_json_in=open("aapl.json", "r") do f
          JSON3.read(f)
       end