Add HashTable.

Author: trekhleb

src/data-structures/hash-table/README.md

@@ -6,4 +6,4 @@
 |Insert                     |O(1)*              |
 |Delete                     |O(1)*              |
 
-* - assuming that we have "good" hash function and big enough hash table size so that collisions are rare. 
+* assuming that we have "good" hash function and big enough hash table size so that collisions are rare.