Add CITATION file

Author: danielru

CITATION.cff

@@ -0,0 +1,21 @@
+cff-version: 1.2.0
+message: If you use this software, please cite both the article from preferred-citation and the software itself.
+authors:
+  - family-names: Ruprecht
+    given-names: Daniel
+title: Wave propagation characteristics of Parareal
+version: 1.0.0
+url: https://doi.org/10.1007/s00791-018-0296-z
+doi: 10.1007/s00791-018-0296-z
+date-released: '2018-12-18'
+preferred-citation:
+  authors:
+    - family-names: Ruprecht
+      given-names: Daniel
+  title: Wave propagation characteristics of Parareal
+  doi: 10.1007/s00791-018-0296-z
+  url: https://doi.org/10.1007/s00791-018-0296-z
+  type: article-journal
+  year: '2018'
+  conference: {}
+  publisher: {}