add folders for week 11

Author: DaleSeo

coin-change/README.md

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+- 문제: https://leetcode.com/problems/coin-change/
+- 풀이: https://www.algodale.com/problems/coin-change/

decode-ways/README.md

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+- 문제: https://leetcode.com/problems/decode-ways/
+- 풀이: https://www.algodale.com/problems/decode-ways/

maximum-product-subarray/README.md

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+- 문제: https://leetcode.com/problems/maximum-product-subarray/
+- 풀이: https://www.algodale.com/problems/maximum-product-subarray/

palindromic-substrings/README.md

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+- 문제: https://leetcode.com/problems/palindromic-substrings/
+- 풀이: https://www.algodale.com/problems/palindromic-substrings/

word-break/README.md

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+- 문제: https://leetcode.com/problems/word-break/
+- 풀이: https://www.algodale.com/problems/word-break/