[FEATURE REQUEST] REST client-server model

**Is your feature request related to a problem? Please describe.**
Not that much people familiar with gRPC client-server model. Do we need simple REST example?

**Describe the solution you'd like**
Prepare JSON structure: same as gRPC's one, but instead of image bytes provide base64 encoded image.

**Describe alternatives you've considered**
nope

**Additional context**
nope
