Add CITATION.cff for software citation information

DOI needs update when paper is released

Author: TNRiley

CITATION.cff

@@ -0,0 +1,44 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+  - family-names: "Riley"
+    given-names: "Trevor N."
+    orcid: "https://orcid.org/0000-0002-6834-9802"
+  - family-names: "Young"
+    given-names: "Sarah"
+    orcid: "https://orcid.org/0000-0002-8301-5106"
+  - family-names: "Paxton"
+    given-names: "Avery B."
+    orcid: "https://orcid.org/0000-0002-4871-9167"
+  - family-names: "Wallrich"
+    given-names: "Lukas"
+    orcid: "https://orcid.org/0000-0003-2121-5177"
+  - family-names: "Hair"
+    given-names: "Kaitlyn"
+    orcid: "https://orcid.org/0000-0003-0180-7343"
+  - family-names: "Grainger"
+    given-names: "Matthew J."
+    orcid: "https://orcid.org/0000-0001-8426-6495"
+title: "CiteSource: An R Package for Data-Driven Search Strategy Development and Enhanced Evidence Synthesis Reporting"
+version: 0.1.1
+doi: TBD 
+url: "https://github.com/ESHackathon/CiteSource"
+preferred-citation:
+  type: article
+  authors:
+    - family-names: "Riley"
+      given-names: "Trevor N."
+    - family-names: "Young"
+      given-names: "Sarah"
+    - family-names: "Paxton"
+      given-names: "Avery B."
+    - family-names: "Wallrich"
+      given-names: "Lukas"
+    - family-names: "Hair"
+      given-names: "Kaitlyn"
+    - family-names: "Grainger"
+      given-names: "Matthew J."
+  title: "CiteSource: An R Package for Data-Driven Search Strategy Development and Enhanced Evidence Synthesis Reporting"
+  journal: "Research Synthesis Methods"
+  year: 2026
+  doi: TBD