Create format of book archive suitable for android app.

[crc83]

Archive should contain:

1. Book itself in PDF
2. JSon with metadata regarding what houns are in specific task in the book
3. JSon that describes relation betwen pictures and nouns

Archive should be suitable to be loaded into android app.
Application should be able to open PDF on the screen from archive.
User should be able to choose the task from PDF.
Application should be able to show images stored there for specific task.

Result of task:
Definition of archive format