Containers: Add robin-hood-hashing, robin-map

Author: myd7349

README.md

@@ -262,6 +262,8 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [plf::list](https://github.com/mattreecebentley/plf_list) - A std::list implementation which removes range splicing in order to enable cache-friendlier structure, yielding significant performance gains. [zLib] [website](http://www.plflib.org/list.htm)
 * [plf::stack](https://github.com/mattreecebentley/plf_stack) - A replacement container for the std::stack container adaptor, with better performance than any std container in a stack context. [zLib] [website](http://www.plflib.org/stack.htm)
 * [ring_span lite](https://github.com/martinmoene/ring-span-lite) - A simplified implementation of Arthur O'Dwyer's ring_span implementation ie. a circular buffer view. [MIT]
+* [robin-hood-hashing](https://github.com/martinus/robin-hood-hashing) - Fast & memory efficient hashtable based on robin hood hashing for C++14. [MIT]
+* [robin-map](https://github.com/Tessil/robin-map) - Fast hash map and hash set using robin hood hashing. [MIT]
 * [sparsepp](https://github.com/greg7mdp/sparsepp) - A fast, memory efficient hash map for C++. [BSD 3-clause]
 
 ## Cryptography