Adds Kotlin solutions for problems #252 and #253

[technophilist]

• File(s) Modified: 0252-meeting-rooms.kt , 0253-meeting-rooms-ii.kt
• Language(s) Used: Kotlin.
• Submission URL: _ https://leetcode.com/problems/meeting-rooms/submissions/970741751/ , https://leetcode.com/problems/meeting-rooms-ii/submissions/972295235/_

Important

Please make sure the file name is lowercase and a duplicate file does not already exist before merging.

[technophilist]

Someone please have a look at the pr. It's been 2 weeks.