add citation.cff

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use this software in your work, please cite it as below."
+title: "AlpacaEval: An Automatic Evaluator of Instruction-following Models"
+authors:
+  - family-names: "Li"
+    given-names: "Xuechen"
+  - family-names: "Zhang"
+    given-names: "Tianyi"
+  - family-names: "Dubois"
+    given-names: "Yann"
+  - family-names: "Taori"
+    given-names: "Rohan"
+  - family-names: "Gulrajani"
+    given-names: "Ishaan"
+  - family-names: "Guestrin"
+    given-names: "Carlos"
+  - family-names: "Liang"
+    given-names: "Percy"
+  - family-names: "Hashimoto"
+    given-names: "Tatsunori B."
+date-released: 2023
+repository: "https://github.com/tatsu-lab/alpaca_eval"
+publisher: "GitHub"
+type: "software"