Create readme.md (mgechev#94)

* Create readme.md

starting comparison table

* Update readme.md

* Update readme.md

updated bubblesort complexity

Author: liesislukas

src/sorting/readme.md

@@ -0,0 +1,21 @@
+# Comparison of all sorting algorithms
+
+| Algorithm                  | Complexity                                          | When to use? |
+|----------------------------|-----------------------------------------------------|--------------|
+| 3-way-string-quicksort.js  | O(N^2)                                              |              |
+| bubblesort.js              | O(N^2)                                              |              |
+| bucketsort.js              | O(N)                                                |              |
+| countingsort.js            | O(N)                                                |              |
+| heapsort.js                | O(N log N)                                          |              |
+| insertion-binary-sort.js   | O(N^2)                                              |              |
+| insertionsort.js           | O(N^2)                                              |              |
+| lsd.js                     | O(N*M) for N keys which have M or fewer digits      |              |
+| mergesort.js               | O(n log(n))                                         |              |
+| msd.js                     | O(N*M) for N keys which have M or fewer digits      |              |
+| oddeven-sort.js            | O(N^2)                                              |              |
+| quicksort-middle.js        | O(N log(N))                                         |              |
+| quicksort.js               | O(nlog n)                                           |              |
+| radixsort.js               | O(N K) for N keys with K being                      |              |
+| recursive-insertionsort.js | O(N^2)                                              |              |
+| selectionsort.js           | O(N^2)                                              |              |
+| shellsort.js               | O((nlog(n))^2)                                      |              |