Add Rabin.

README.md

@@ -41,8 +41,8 @@
 * **String**
   * [Levenshtein Distance](https://github.com/trekhleb/javascript-algorithms/tree/master/src/algorithms/string/levenshtein-distance) - minimum edit distance between two sequences (DP approach)
   * [Hamming Distance](https://github.com/trekhleb/javascript-algorithms/tree/master/src/algorithms/string/hamming-distance) - number of positions at which the symbols are different
-  * [Knuth–Morris–Pratt algorithm](https://github.com/trekhleb/javascript-algorithms/tree/master/src/algorithms/string/knuth-morris-pratt) - substring search
-  * Rabin Karp
+  * [Knuth–Morris–Pratt Algorithm](https://github.com/trekhleb/javascript-algorithms/tree/master/src/algorithms/string/knuth-morris-pratt) - substring search
+  * [Rabin Karp Algorithm](https://github.com/trekhleb/javascript-algorithms/tree/master/src/algorithms/string/rabin-karp) - substring search
   * Longest common subsequence
   * longest common substring
 * **Search**

src/algorithms/string/rabin-karp/README.md

@@ -0,0 +1,24 @@
+# Rabin Karp Algorithm
+
+In computer science, the Rabin–Karp algorithm or Karp–Rabin algorithm 
+is a string searching algorithm created by Richard M. Karp and 
+Michael O. Rabin (1987) that uses hashing to find any one of a set 
+of pattern strings in a text. 
+
+## Complexity
+
+For text of length `n` and `p` patterns 
+of combined length `m`, its average and best case running time is 
+`O(n + m)` in space `O(p)`, but its worst-case time is `O(n * m)`. 
+
+## Application
+
+A practical application of the algorithm is detecting plagiarism. 
+Given source material, the algorithm can rapidly search through a paper 
+for instances of sentences from the source material, ignoring details 
+such as case and punctuation. Because of the abundance of the sought 
+strings, single-string searching algorithms are impractical.
+
+## References
+
+[Wikipedia](https://en.wikipedia.org/wiki/Rabin%E2%80%93Karp_algorithm)