Add CHANGELOG.md

Author: sbliven

CHANGELOG.md

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+RCSB Symmetry
+-------------
+
+## CE-Symm 2.1.0 (symmetry-2.1.0)
+
+Released 9 January 2019.
+
+Includes both CE-Symm and QuatSymm.
+
+This version requires Java 8 or newer.
+
+New features:
+
+- Use BioJava 5.2.0, which brings lots of improvements:
+  - Support Java 8-11 (#97)
+  - Improved structure parsing (e.g. better symmetry operator support, mmCIF & MMTF parsing, better distinction between asymm_id and auth_id for identifying chains, etc)
+  - Newer Jmol version
+- Better documentation (#96)
+- Separate QuatSymm package
+
+
+## CE-Symm 2.0.0 (symmetry-2.0.0)
+
+Released 3 July 2018 after a long period of beta release candidates.
+
+This version requires Java 7-8.
+
+New features:
+
+- Multiple alignment between all repeats of the protein
+- Detection of multiple axes of symmetry (both dihedral point groups and hierarchical symmetry)
+- Detection and visualization of point groups
+- Better symmetry detection
+- Monte-Carlo alignment optimization
+- GUI/visualization improvements
+- Major command line option changes
+- Based on BioJava 4.2.12
+  - Diverse input formats (pdb, mmcif, local & remote files, chain & residue selections)
+  - Numerous bug fixes & improvements
+
+
+## CE-Symm 1.0.0 (symmetry-tools-1.0.0)
+
+Released 18 August 2014
+
+This is the initial release of the CE-Symm tool. It corresponds to the version
+used in Myers-Turnbull (2014).
+
+This version runs on Java 6-8.
+
+Note that the git history at this time is convoluted due to the merging of
+several projects. The similarly-named symmetry-1.0.0 tag contains only
+quaternary symmetry code, rather than CE-Symm. Further reorganizations followed
+the migration of stable quaternary symmetry and ce-symm code into BioJava.