[v1.2.5] Add and Delete Witness

[Jargonx]

Closes #15 #9

[codecov-io]

Codecov Report

Merging #133 into master will decrease coverage by 1.97%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #133      +/-   ##
============================================
- Coverage     58.74%   56.77%   -1.98%     
  Complexity      443      443              
============================================
  Files           102      105       +3     
  Lines          1755     1816      +61     
  Branches        201      212      +11     
============================================
  Hits           1031     1031              
- Misses          656      717      +61     
  Partials         68       68              

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...ic/commands/witnesscommands/AddWitnessCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...commands/witnesscommands/DeleteWitnessCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...a/seedu/address/logic/parser/AddCommandParser.java	24.00% <0.00%> (-1.00%)	3.00 <0.00> (ø)
.../address/logic/parser/AddWitnessCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...eedu/address/logic/parser/DeleteCommandParser.java	32.35% <0.00%> (-0.99%)	3.00 <0.00> (ø)

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[Vielheim]

LGTM