Add citation file

Author: mdekstrand

CITATION.cff

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+# This CITATION.cff file was generated with cffinit.
+# Visit https://bit.ly/cffinit to generate yours today!
+
+cff-version: 1.2.0
+title: Grapht
+message: 'If you use this software, please cite the paper below.'
+type: software
+authors:
+  - given-names: Michael D.
+    family-names: Ekstrand
+    email: [email protected]
+    affiliation: Drexel University
+    orcid: 'https://orcid.org/0000-0003-2467-0108'
+  - given-names: Michael
+    family-names: Ludwig
+identifiers:
+  - type: doi
+    value: 10.5381/jot.2016.15.1.a1
+    description: Grapht description paper
+license: MIT
+preferred-citation:
+  authors:
+    - family-names: Ekstrand
+      given-names: Michael D.
+    - family-names: Ludwig
+      given-names: Michael
+  title: "Dependency Injection with Static Analysis and Context-Aware Policy"
+  type: article
+  journal: Journal of Object Technology
+  volume: 14
+  issue: 1
+  year: 2016