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Add Solution.java to problems 0530

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	`1`	`+/**`
	`2`	`+ * Definition for a binary tree node.`
	`3`	`+ * public class TreeNode {`
	`4`	`+ * int val;`
	`5`	`+ * TreeNode left;`
	`6`	`+ * TreeNode right;`
	`7`	`+ * TreeNode(int x) { val = x; }`
	`8`	`+ * }`
	`9`	`+ */`
	`10`	`+class Solution {`
	`11`	`+ public int getMinimumDifference(TreeNode root) {`
	`12`	`+ Integer res = Integer.MAX_VALUE, prev = Integer.MAX_VALUE;`
	`13`	`+ Stack<TreeNode> stack = new Stack<>();`
	`14`	`+ while (true) {`
	`15`	`+ while (root != null) {`
	`16`	`+ stack.push(root);`
	`17`	`+ root = root.left;`
	`18`	`+ }`
	`19`	`+ if (stack.isEmpty()) break;`
	`20`	`+ TreeNode node = stack.pop();`
	`21`	`+ res = Math.min(res, Math.abs(node.val - prev));`
	`22`	`+ prev = node.val;`
	`23`	`+ root = node.right;`
	`24`	`+ }`
	`25`	`+ return res;`
	`26`	`+ }`
	`27`	`+}`

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