Parse spaceapi.json file

[sportfloh]

Parse the local spaceapi.json file to use for testing

Hints:

• https://stackoverflow.com/questions/61505904/how-can-i-parse-a-local-json-file-to-a-listview-in-swiftui-new-to-app-developme
• https://www.avanderlee.com/swift/json-parsing-decoding/

[dertika]

load the single Hackspaces in the struct BrowseView