Added AutoML API C# samples (#410)

Author: CESARDELATORRE

datasets/README.md

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+MICROSOFT PROVIDES THE DATASETS ON AN "AS IS" BASIS. MICROSOFT MAKES NO WARRANTIES, EXPRESS OR IMPLIED, GUARANTEES OR CONDITIONS WITH RESPECT TO YOUR USE OF THE DATASETS. TO THE EXTENT PERMITTED UNDER YOUR LOCAL LAW, MICROSOFT DISCLAIMS ALL LIABILITY FOR ANY DAMAGES OR LOSSES, INLCUDING DIRECT, CONSEQUENTIAL, SPECIAL, INDIRECT, INCIDENTAL OR PUNITIVE, RESULTING FROM YOUR USE OF THE DATASETS.
+
+The datasets are provided under the original terms that Microsoft received such datasets. See below for more information about each dataset.
+
+### MNIST
+
+> Redistributing the dataset "optdigits-train.csv", "optdigits-val.csv" with citation:
+
+> Dua, D. and Karra Taniskidou, E. (2017). UCI Machine Learning Repository [http://archive.ics.uci.edu/ml]. Irvine, CA: University of California, School of Information and Computer Science. 
+
+> Original source: http://archive.ics.uci.edu/ml/datasets/Optical+Recognition+of+Handwritten+Digits
+
+### NYC Taxi Fare
+
+> Redistributing the dataset "taxi-fare-test.csv", "taxi-fare-train.csv" with attribution:
+
+> Original source: http://www.nyc.gov/html/tlc/html/about/trip_record_data.shtml.
+
+> The dataset is provided under terms provided by City of New York: https://opendata.cityofnewyork.us/overview/#termsofuse.
+
+### Wikipedia Detox
+
+>This dataset is provided under [CC0](https://creativecommons.org/share-your-work/public-domain/cc0/). Redistributing the dataset "wikipedia-detox-250-line-data.tsv" with attribution:
+>
+> Wulczyn, Ellery; Thain, Nithum; Dixon, Lucas (2016): Wikipedia Detox. figshare.
+>
+>With modifications by taking a sample of rows and reducing rough language.
+>
+>Original source: https://doi.org/10.6084/m9.figshare.4054689
+>
+>Original readme: https://meta.wikimedia.org/wiki/Research:Detox