Update README.md

lazer88 · Aug 27, 2016 · fb80909 · fb80909
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 [Evaluate Reverse Polish Notation](https://leetcode.com/problems/evaluate-reverse-polish-notation/)| [Swift](./Stack/EvaluateReversePolishNotation.swift)| Medium| ★★★|
 [Maximum Product Subarray](https://leetcode.com/problems/maximum-product-subarray/)| [Swift](./DP/MaximumProductSubarray.swift)| Medium| ★★★|
 [Product of Array Except Self](https://leetcode.com/problems/product-of-array-except-self/)| [Swift](./Array/ProductExceptSelf.swift)| Medium| ★★★|
+[Symmetric Tree](https://leetcode.com/problems/symmetric-tree/)| [Swift](./Tree/SymmetricTree.swift)| Easy| ★★|
 
 ## Amazon
 | Title | Solution | Difficulty | Frequency |