Add credit to README

README.md

@@ -351,5 +351,38 @@ If your pull request including new function, please write test cases for it.
 
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+## Credit
+
+#### Bibliography
+DifferenceKit was developed with reference to the following excellent materials.  
+
+- [A technique for isolating differences between files](https://dl.acm.org/citation.cfm?id=359467) by [Paul Heckel](https://dl.acm.org/author_page.cfm?id=81100051772)
+- [DifferenceAlgorithmComparison](https://github.com/horita-yuya/DifferenceAlgorithmComparison) by [@horita-yuya](https://github.com/horita-yuya)
+- [RxDataSources](https://github.com/RxSwiftCommunity/RxDataSources) by [@kzaher](https://github.com/kzaher), [RxSwiftCommunity](https://github.com/RxSwiftCommunity)
+
+#### OSS using DifferenceKit
+The list of the awesome OSS which uses this library.  
+They also help to understanding how to use DifferenceKit.  
+
+- [Rocket.Chat.iOS](https://github.com/RocketChat/Rocket.Chat.iOS) by [RocketChat](https://github.com/RocketChat)
+- [wire-ios](https://github.com/wireapp/wire-ios) by [wireapp](https://github.com/wireapp)
+- [ReactiveLists](https://github.com/plangrid/ReactiveLists) by [plangrid](https://github.com/plangrid)
+- [ReduxMovieDB](https://github.com/cardoso/ReduxMovieDB) by [cardoso](https://github.com/cardoso)
+- [TetrisDiffingCompetition](https://github.com/skagedal/TetrisDiffingCompetition) by [skagedal](https://github.com/skagedal)
+
+#### Other diffing libraries
+I respect and ️❤️ all libraries involved in diffing.  
+
+- [IGListKit](https://github.com/Instagram/IGListKit) by [Instagram](https://github.com/Instagram)
+- [FlexibleDiff](https://github.com/RACCommunity/FlexibleDiff) by [andersio](https://github.com/andersio), [RACCommunity](https://github.com/RACCommunity)
+- [DeepDiff](https://github.com/onmyway133/DeepDiff) by [onmyway133](https://github.com/onmyway133)
+- [Changeset](https://github.com/osteslag/Changeset) by [osteslag](https://github.com/osteslag)
+- [Differ](https://github.com/tonyarnold/Differ) by [tonyarnold](https://github.com/tonyarnold)
+- [Diff.swift](https://github.com/wokalski/Diff.swift) by [wokalski](https://github.com/wokalski)
+- [Dwifft](https://github.com/jflinter/Dwifft) by [jflinter](https://github.com/jflinter)
+- [ListDiff](https://github.com/lxcid/ListDiff) by [lxcid](https://github.com/lxcid)
+
+---
+
 ## License
 DifferenceKit is released under the [Apache 2.0 License](https://github.com/ra1028/DifferenceKit/blob/master/LICENSE).