Add schedule command to DG

[Rikko1204]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.07692% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 76.16%. Comparing base (02d35e7) to head (bf62654).
Report is 41 commits behind head on master.

Files	Patch %	Lines
...seedu/address/logic/parser/GroupCommandParser.java	50.00%	1 Missing and 6 partials ⚠️
...ava/seedu/address/logic/commands/GroupCommand.java	92.10%	0 Missing and 3 partials ⚠️
src/main/java/seedu/address/MainApp.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #116      +/-   ##
============================================
- Coverage     76.44%   76.16%   -0.29%     
- Complexity      521      582      +61     
============================================
  Files            82       84       +2     
  Lines          1690     1913     +223     
  Branches        169      214      +45     
============================================
+ Hits           1292     1457     +165     
- Misses          347      383      +36     
- Partials         51       73      +22     

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