Add CHANGELOG

CHANGELOG.md

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+## [Unreleased]
+
+  - Automatically determine solution asymptotic complexity
+  - Highlight mismatched items in arrays (when printing test failure explanation)
+  - Add HTML file to track progress on exercises (list of exercises with number of passed tests in each language)
+  - Run each test case with a timeout
+
+
+## [Beta 4] - 2018-05-??
+
+### Added
+  - This changelog 
+
+### Changed
+  - [IMPORTANT] Java project now requires at least Java 9 JDK
+  - Java JSON library is divided into separate files
+  - Some solution code improvements
+
+### Fixed
+  - Issue with C++ anonymous namespaces
+  - Several warnings issued by VS2017  
+
+### Removed
+  - All test cases with binary trees with height greater than 500
+
+
+## [Beta 3] - 2018-04-05
+
+### Added
+  - Exercise solutions
+
+
+## [Beta 2] - 2018-03-27
+
+### Added
+  - Print argument names on test failure
+  - Shared configuration file as an alternative for command-line parameters
+
+
+### Changed
+  - Make C++ framework C++14 conformant (previously C++17)
+  - Better support for detailed test failure explanation
+  - Change command-line interface
+  - Move include and import statements to top
+
+
+### Fixed
+  - Missing res_printer in search_for_min_max_in_array.py  
+  - Replace all long type usages with long long 
+
+
+## [Beta 1] - 2018-02-01
+### Added
+  - Judge exercises in C++, Java, and Python
+  - Test framework for implementation evaluation
+  - Thousands of test cases
+  - Makefile and CMake (C++ only) projects
+  - Test run timing
+  - Video tutorials
+