Commit c0088ab

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feat: add symmetric tree

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	`1`	`+from collections import deque`
	`2`	`+def symmetric_tree(root):`
	`3`	`+ queue = deque([root.left, root.right])`
	`4`	`+`
	`5`	`+ while queue:`
	`6`	`+ curr_left = queue.popleft()`
	`7`	`+ curr_right = queue.popleft()`
	`8`	`+`
	`9`	`+ if not curr_left and not curr_right:`
	`10`	`+ continue`
	`11`	`+`
	`12`	`+ if not curr_right or not curr_left:`
	`13`	`+ return False`
	`14`	`+`
	`15`	`+ if curr_left.val != curr_right.val:`
	`16`	`+ return False`
	`17`	`+`
	`18`	`+ queue.append(curr_left.left)`
	`19`	`+ queue.append(curr_right.right)`
	`20`	`+ queue.append(curr_left.right)`
	`21`	`+ queue.append(curr_right.left)`
	`22`	`+`
	`23`	`+ return True`

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