Feat/add graph and rest part 1

RESTfull client

[x] Functional editor enabling query editing and prettifying, request body provided in the url as base64-encoded on focus out. - 40 points
[ ] Functional read-only response section, with information about HTTP status and the code. - 30 mpoints
[ ] Method selector, shows all the valid HTTP verbs, value is provided in the url on change. - 10 points
[x] Input for the url, entered value is provided in base64-encoded way on change. - 15 points
[x] Variables section that can shown or hidden, specified variables are included in the body. - 15 points
[x] Headers section, value is provided in the url on header add/change. - 20 points

GraphiQL route

[x] Functional editor enabling query editing and prettifying, request body provided in the url as base64-encoded on focus out. - 35 points
[x] Read-only response section, with information about HTTP status and the code, reused from the RESTfull client. - 5 points
[ ] Operational documentation explorer, visible only upon successful SDL request. - 20 points
[x] Variables section that can shown or hidden, specified variables are included in the body. - 10 points
[x] Header section that can be shown or hidden, value is provided in the url on header add/change. - 10 points

YourunB / graphiql-app