Implement cache system #8
Description
As it is indicated in #6, the tldr-pages client specification recommends to develop a cache system. Quoted from the mentioned issue:
- It is recommended to implement a cache of pages. If it is implmented it should download the archive from https://raw.githubusercontent.com/tldr-pages/tldr-pages.github.io/master/assets/tldr.zip.
- If it is implemented, it should be done according to the user's language configuration if there is any to not waste space.
- It should provide an option to update the cache, as the one described in the Arguments group described above.
Probably this will consists a major change, so it is assigned to the milestone v1.0.0.