Added function to get place of service information

[TheCedarPrince]

This function was created to get the place of service type associated with a given visit.

[codecov[bot]]

Codecov Report

Merging #39 (3a17f4c) into dev (32fe5d4) will decrease coverage by 2.89%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev      #39      +/-   ##
==========================================
- Coverage   73.68%   70.78%   -2.90%     
==========================================
  Files           5        5              
  Lines         171      178       +7     
==========================================
  Hits          126      126              
- Misses         45       52       +7     

Impacted Files	Coverage Δ
src/getters.jl	84.44% <0.00%> (-7.13%)	:arrow_down:

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