Add ParseNric method in Parser.util

[mounilsankar]

This will allow for standardisation for the parsing of NRIC argument across patient/doctor/appointment

[codecov[bot]]

Codecov Report

Merging #85 (327640b) into master (9d3e9f6) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #85      +/-   ##
============================================
+ Coverage     78.18%   78.24%   +0.06%     
- Complexity      560      562       +2     
============================================
  Files            81       81              
  Lines          1650     1655       +5     
  Branches        163      164       +1     
============================================
+ Hits           1290     1295       +5     
  Misses          320      320              
  Partials         40       40              

Files	Coverage Δ
...in/java/seedu/address/logic/parser/ParserUtil.java	97.50% <100.00%> (+0.27%)	:arrow_up:
src/main/java/seedu/address/model/person/Nric.java	93.33% <100.00%> (+0.47%)	:arrow_up:

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