How to create a Snap package for a software?

The snapcraft.io website and snap creation page is the definitive guide on how to snap a software program.

You should be able to just unzip the file in a folder, add a snapcraft.yaml file and run snapcraft snap. snapcraft.yaml should probably look something like this:

name: vokoscreen
version: 0.1
summary: Vokoscreen screencast creator
description: >
  Vokoscreen is an easy to use screencast creator
  to record educational videos, live recordings of
  browser, installation, videoconferences, etc.

apps:
  vokoscreen:
    command: vokoscreen.run