Update UG for v1.3

[BobbyZhouZijian]

UG for v1.3

[codecov-io]

Codecov Report

Merging #213 into master will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #213      +/-   ##
============================================
- Coverage     41.45%   41.44%   -0.02%     
  Complexity      550      550              
============================================
  Files           112      112              
  Lines          2762     2763       +1     
  Branches        395      395              
============================================
  Hits           1145     1145              
- Misses         1508     1509       +1     
  Partials        109      109              

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/seedu/address/model/task/event/Event.java	46.42% <0.00%> (-0.85%)	16.00 <0.00> (ø)
.../java/seedu/address/model/util/SampleDataUtil.java	0.00% <ø> (ø)	0.00 <0.00> (ø)

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[MarcTzh]

LGTM