Update README.md

Author: zenglekidd

README.md

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 # LeetcodeInSwift
-Leetcode challenge solutions in Swift Playground. Order of the problems based on Source: [The 30-minute guide to rocking your next coding interview](https://www.freecodecamp.org/news/coding-interviews-for-dummies-5e048933b82b/)
+Tracking personal Leetcode progress. The order of the problems for stage 1 and 2 are based on: [The 30-minute guide to rocking your next coding interview](https://www.freecodecamp.org/news/coding-interviews-for-dummies-5e048933b82b/)
 
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