Update README for problem 743

Author: anirudhology

README.md

@@ -135,6 +135,7 @@ LeetCode solutions in Go programming language.
 | 703        | Kth Largest Element In A Stream                           | [Solution](problems/heaps/kth_largest_element_in_a_stream.go)                              | Easy       | Heap                                  |
 | 704        | Binary Search                                             | [Solution](problems/binary_search/binary_search.go)                                        | Easy       | Binary Search                         |
 | 739        | Daily Temperatures                                        | [Solution](problems/stack/daily_temperatures.go)                                           | Medium     | Stack, Monotonic Stack                |
+| 743        | Network Delay Time                                        | [Solution](problems/graph/network_delay_time.go)                                           | Medium     | Graph, Dijkstra's                     |
 | 746        | Min Cost Climbing Stairs                                  | [Solution](problems/dynamic_programming/min_cost_climbing_stairs.go)                       | Easy       | Dynamic Programming                   |
 | 763        | Partition Labels                                          | [Solution](problems/greedy/partition_labels.go)                                            | Medium     | Greedy                                |
 | 846        | Hand Of Straights                                         | [Solution](problems/greedy/hand_of_straights.go)                                           | Medium     | Greedy                                |