Add new file: separated out the RELEASES info from the README.md

RELEASES.md

+# UEABS Releases
+
+## Version 2.0 (PRACE-5IP MS31, May 31, 2018)
+
+ * Reconstructed this versioned git repository from a "flat" web site representation
+ * Merged back the (Version 1.2 based) Accelerator Benchmark Suite:
+  + Added PFARM and SHOC
+  + Added: README_ACC.md files (for the 11 accelerator benchmark applications)
+
+## Version 1.3 (PRACE-4IP, May 31, 2017)
+
+ * CP2K: updated build instructions and datasets
+ * QCD: new version of code and dataset
+ * ALYA: new datasets
+ * Code_Saturne: new code version, build instructions, and datasets
+ * Quantum Espresso: new build/run instructions
+
+## Accelerator Benchmark Suite (PRACE-4IP, April 30, 2017)
+
+This started as a fork / subset of UEABS Version 1.2:
+
+ * Removed: Gadget, GENE, NEMO, QCD except kernel E
+ * Added: PFARM and SHOC
+ * Added: README_ACC.md files
+
+## Version 1.2 (PRACE-4IP MS29, October 31, 2016)
+
+ * GENE: new version of code and additional new dataset.
+ * GPAW: new version of code and new dataset.
+ * GROMACS: new version of code and updated dataset.
+ * NAMD: new version of code and minor build and run instructions updates.
+ * NEMO: new version of code and replaced dataset.
+
+## Version 1.1 (PRACE-3IP, May 31, 2014)
+
+ * ALYA: new version of code and new datasets.
+ * Code_Saturne: additional large dataset, using tetrahedralelements.
+ * CP2K: new build instructions.
+ * GPAW: new dataset with reduced runtime.
+
+## Version 1.0 (PRACE-2IP, October 31, 2013)
+ * Initial Release
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