Add logging statements

[GlendaChong]

• Add logging statements in Add and Filter Command

[codecov[bot]]

Codecov Report

Merging #264 (fc83e60) into master (576cde5) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #264      +/-   ##
============================================
+ Coverage     74.14%   74.19%   +0.05%     
  Complexity      579      579              
============================================
  Files            88       88              
  Lines          1895     1899       +4     
  Branches        220      220              
============================================
+ Hits           1405     1409       +4     
  Misses          409      409              
  Partials         81       81              

Files	Coverage Δ
.../java/seedu/address/logic/commands/AddCommand.java	100.00% <100.00%> (ø)
...va/seedu/address/logic/commands/FilterCommand.java	95.23% <100.00%> (+0.50%)	:arrow_up: