docs: Added solutions list and updated README.md

Author: maxchui

0001-1000.md

@@ -0,0 +1,13 @@
+# Problems 0001-1000
+
+## Algorithms
+
+* [Hash Table](#hash-table)
+
+## Hash Table
+
+|  #  | Title           |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note|  
+|-----|---------------- | --------------- | --------------- | --------------- | ------------- |--------------|-----|
+|0001|[Two Sum](https://leetcode.com/problems/two-sum/)| [C#](./C#/1-Two_Sum.cs)| $O(n)$| $O(n)$|Easy|||  
+|0049|[Group Anagrams](https://leetcode.com/problems/group-anagrams/)| [C#](./C#/49-Group_Anagrams.cs)| $O(n \cdot  m \cdot log(m))$| $O(n \cdot m)$|Medium|||
+|0217|[Contains Duplicate](https://leetcode.com/problems/contains-duplicate/)| [C#](./C#/217-Contains_Duplicate.cs)| $O(n)$| $O(n)$|Easy|||

README.md

@@ -8,7 +8,7 @@
 
 ## Solutions
 
-* TBA
+* [0001-1000](./0001-1000.md)
 
 ## Acknowledgements