Add FAQ on how to load snapshots

[aizatazhar]

Closes #255

[codecov]

Codecov Report

Merging #267 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #267   +/-   ##
=========================================
  Coverage     73.70%   73.70%           
  Complexity      528      528           
=========================================
  Files            83       83           
  Lines          1567     1567           
  Branches        154      154           
=========================================
  Hits           1155     1155           
  Misses          352      352           
  Partials         60       60           

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