Create 0101-symmetric-tree-iteratively.go and 0101-symmetric-tree-recursively.go

[Alex0M]

File(s) Modified: 0101-symmetric-tree-iteratively.go, 0101-symmetric-tree-recursively.go
Language(s) Used: Go
Submission URL: https://leetcode.com/problems/symmetric-tree/submissions/914189041/
https://leetcode.com/problems/symmetric-tree/submissions/914181009/

[Ykhan799]

@Alex0M Put both of your solutions into one file and rename the file to 0101-symmetric-tree.go