Grab images from free Stock into csv file

[fornit1917]

Create console app for grabbing images from Pixabay or Pexels (or from both of them).

The following data should be saved into csv file for each image:

• ExternalId (image id on photo stock service)
• SmallPreviewUrl (preview from list)
• LargePreviewUrl (preview with ~800-1000px on largest size)
• OriginalUrl (link for file with largest size)
• Title
• Keywords
• Description (if available)
• Width (width of largest version)
• Height (height of largest version)
• FileSize (files size of largest version in bytes)
• DCTHash (hash can be calculated from small preview using code from ImageHash project. Ask Maxim and Daniil about details).

Parameters for console app:

• Service (which service will be used for grabbing)
• Count (how many images should be grabbed)
• OutputFileName