Create CHANGELOG.md

CHANGELOG.md

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+# Changes
+
+This log documents significant changes for each release.
+
+## [0.6.0] - 2021-03-31
+
+* Support for unlimited results when used as a library, and when processing expressions
+* Harmonise web service key names to use camel case and not mix in kebab-case.
+* Expose library API call to get installed reference sets
+* Expose support for 'Accept-Language' using BCP 47 language tags in REST server, with additional support for specific language reference set extension of form en-gb-x-XXXX where XXXX is preferred language refset.  
+* Release information included in log files
+
+## [0.5.0] - 2021-03-09
+
+* Minor fixes
+
+## [0.4.0] - 2021-03-08
+
+* Major change to backend store with new custom serialization resulting in enormous speed-up and size benefits.
+* UK dictionary of medicines and devices (dm+d) custom code extracted to [another repository](https://github.com/wardle/dmd) 
+* Add support for transitive synonyms
+
+## [0.3.0] - 2021-01-27
+
+* Add special custom extension for UK dictionary of medicines and devices (dm+d) to bring in non-SNOMED BSA data
+* SNOMED ECL (expression constraint language) support
+* SNOMED CG (compositional grammar) support  
+* Major improvements to server and backend. Unified terminology service abstracting underlying implementations.
+
+## [0.2.0] - 2020-11-18
+
+* Added search and autocompletion using Apache Lucene
+
+## [0.1.0] - 2020-11-12
+
+* Basic SNOMED service (store/retrieval/inference)
+