Add functional test

[amitguptagwl]

We're planning to add functional tests using cytorus js(cypress js).

[lexcorp16]

Hi @amitguptagwl how do you intend to approach this and how can I help?

[amitguptagwl]

@lexcorp16 thanks for showing your interest. Well! we can create a folder say ft or functionatests within this repo. Setup cypress repo inside, write a script that can start imglab locally and run the functional tests against it.