Create CITATION.cff

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+title: "SINGA: A distributed deep learning platform"
+url: "https://github.com/apache/singa"
+preferred-citation:
+  type: article
+  authors:
+  - family-names: "Ooi"
+    given-names: "Beng Chin"
+  - family-names: "Tan"
+    given-names: "Kian-Lee"
+  - family-names: "Sheng"
+    given-names: "Wang"
+  - family-names: "Wang"
+    given-names: "Wei"
+  - family-names: "Cai"
+    given-names: "Qingchao"
+  - family-names: "Chen"
+    given-names: "Gang"
+  - family-names: "Gao"
+    given-names: "Jinyang"
+  - family-names: "Luo"
+    given-names: "Zhaojing"
+  - family-names: "Tung"
+    given-names: "Anthony K. H."
+  - family-names: "Yuan"
+    given-names: "Wang"
+  - family-names: "Xie"
+    given-names: "Zhongle"
+  - family-names: "Zhang"
+    given-names: "Meihui"
+  - family-names: "Zheng"
+    given-names: "Kaiping"
+  title: "SINGA: A distributed deep learning platform"
+  doi: 0.1145/2733373.2807410
+  url: "https://github.com/apache/singa"