Merge pull request #60 from common-workflow-language/citation_fix

clarify CWL citation versus user guide citation

Author: tobyhodges

CITATION

@@ -1,8 +1,33 @@
 # Citation
 
-Our preferred DOI is http://doi.org/10.5281/zenodo.840129
+To cite CWL as a project, as a language, or as a standard, use:
 
-The latest DOI is:
+Amstutz, Peter; Crusoe, Michael R; Tijanić, Nebojša; Chapman, Brad;
+Chilton, John; Heuer, Michael; Kartashov, Andrey; Kern, John; Leehr, Dan;
+Ménager, Hervé; Nedeljkovich, Maya; Scales, Matt; Soiland-Reyes, Stian;
+Stojanovic, Luka (2016): Common Workflow Language, v1.0. Specification,
+Common Workflow Language working group. https://w3id.org/cwl/v1.0/
+https://dx.doi.org/10.6084/m9.figshare.3115156.v2
+
+@data{cwl,
+  doi = {10.6084/m9.figshare.3115156.v2},
+  url = {http://dx.doi.org/10.6084/m9.figshare.3115156.v2},
+  author = {Peter Amstutz; Michael R. Crusoe; Nebojša Tijanić; Brad Chapman;
+John Chilton; Michael Heuer; Andrey Kartashov; John Kern; Dan Leehr;
+Hervé Ménager; Maya Nedeljkovich; Matt Scales; Stian Soiland-Reyes;
+Luka Stojanovic
+ },
+  publisher = {Figshare},
+  institution = {Common Workflow Language working group},
+  title = {Common Workflow Language, v1.0},
+  year = {2016}
+}
+
+# the above is from https://github.com/common-workflow-language/common-workflow-language/blob/master/CITATION
+
+Our preferred DOI for the "CWL User Guide" is http://doi.org/10.5281/zenodo.840129
+
+The latest DOI for the "CWL User Guide" is:
 [![DOI](https://zenodo.org/badge/89621457.svg)](https://zenodo.org/badge/latestdoi/89621457)
 
 The structure and style of this user guide is derived from [the Carpentries](https://github.com/carpentries)