CHANGELOG: Create a changelog for CLiC with some high-level notes

CHANGELOG.md

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+## [Unreleased]
+
+* Fix nonquote/all subset queries when a chapter is empty
+* Code samples for direct CLiC API usage
+* Remove useless "0 from start" option in KWICGrouper
+
+## 1.6.1 (2017-11-08)
+
+* Work around file-handle leaks in cheshire3
+* Row selection fixes
+* Fix /subsets redirect
+* Add CLiC & corpora versions to every API response
+* Empty CLiC cache on re-install
+* Fix header colour
+
+## 1.6.0 (2017-11-02)
+
+* Rework entire CLiC codebase & repository, removing old code and large commits. Old code is available at https://github.com/birmingham-ccr/clic-legacy
+* Split CLiC into distinct REST API and clientside SPA parts
+* Rework CLiC UI