Edit UserGuide

[jiahui0309]

• Added appendix section
• Changed the prefix symbol from / to \

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.68%. Comparing base (56f1b3e) to head (cb65d40).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #153      +/-   ##
============================================
- Coverage     70.80%   70.68%   -0.13%     
  Complexity      499      499              
============================================
  Files            81       81              
  Lines          1730     1733       +3     
  Branches        175      175              
============================================
  Hits           1225     1225              
- Misses          436      439       +3     
  Partials         69       69              

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[tengcharmaine]

LGTM!