added citation file + minor readme update
diff --git a/CITATION.cff b/CITATION.cff
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+cff-version: 1.2.0
+message: "If you use this R package, please cite it as below."
+authors:
+- family-names: "Kleinberg"
+ given-names: "Bennett"
+ orcid: "https://orcid.org/0000-0003-1658-9086"
+title: "rgpt3: Making requests from R to the GPT-3 API"
+version: 0.2.1
+date-released: 2022-10-24
+url: "https://github.com/ben-aaron188/rgpt3"