add citation

README.md

@@ -94,6 +94,18 @@ American English
 - Some annotators may not be native English speakers
 - Annotator demographics and subject matter may reflect the makeup of Databricks employees
 
+# Citation
+
+```
+@online{DatabricksBlog2023DollyV2,
+    author    = {Mike Conover and Matt Hayes and Ankit Mathur and Jianwei Xie and Jun Wan and Sam Shah and Ali Ghodsi and Patrick Wendell and Matei Zaharia and Reynold Xin},
+    title     = {Free Dolly: Introducing the World's First Truly Open Instruction-Tuned LLM},
+    year      = {2023},
+    url       = {https://www.databricks.com/blog/2023/04/12/dolly-first-open-commercially-viable-instruction-tuned-llm},
+    urldate   = {2023-06-30}
+}
+```
+
 # License/Attribution
 **Copyright (2023) Databricks, Inc.**
 This dataset was developed at Databricks (https://www.databricks.com) and its use is subject to the CC BY-SA 3.0 license.