Add and delete theater

[coveralls]

Pull Request Test Coverage Report for Build 119

• 1 of 142 (0.7%) changed or added relevant lines in 6 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-4.5%) to 76.875%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/java/seedu/address/logic/parser/MoviePlannerParser.java	0	2	0.0%
src/main/java/seedu/address/logic/parser/DeleteTheaterCommandParser.java	0	16	0.0%
src/main/java/seedu/address/logic/parser/AddTheaterCommandParser.java	0	16	0.0%
src/main/java/seedu/address/logic/commands/AddTheaterCommand.java	0	53	0.0%
src/main/java/seedu/address/logic/commands/DeleteTheaterCommand.java	0	54	0.0%
<!--	Total:	1	142	0.7%	-->

Files with Coverage Reduction	New Missed Lines	%
src/main/java/seedu/address/model/cinema/Theater.java	1	65.22%
<!--	Total:	1		-->

Totals
Change from base Build 118:	-4.5%
Covered Lines:	1978
Relevant Lines:	2573

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💛 - Coveralls