feat: add data objects

.gitignore

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+**/.DS_Store

raw/DATA-DESCRIPTION.txt

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+Each timestamped simplex dataset consists of three files:
+1. dataset-nverts.txt
+2. dataset-simplices.txt
+3. dataset-times.txt
+
+All three files represent a vector of integers. There is one integer per line.
+
+The first file contains the number of vertices within each simplex. The second
+file is a contiguous list of the nodes comprising the simplices, where the
+ordering of the simplices is the same as in the first file. The third file
+contains the timestamps for each simplex. The length of the vectors in the first
+and third files is the same, and the length of the vector in the second file is
+the sum of the integers in the first file.
+
+Consider an example dataset consisting of three simplices:
+1. {1, 2, 3} at time 10
+2. {2, 4} at time 15.
+3. {1, 3, 4, 5} at time 21.
+Then files would look as follows:
+
+example-nverts.txt
+3
+2
+4
+
+example-simplices.xt
+1
+2
+3
+2
+4
+1
+3
+4
+5
+
+example-times.txt
+10
+15
+21
+
+
+
+For problems, please contact Austin Benson at arb@cs.cornell.edu.

raw/README.txt

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+This dataset consists of the substances that make up drugs in the National Drug
+Code Directory maintained by the Food and Drug Administration. The original data
+was downloaded from https://www.fda.gov/Drugs/InformationOnDrugs/ucm142438.htm.
+Each simplex corresponds to an NDC code for a drug, where the nodes are the
+substances that make up that drug. Timestamps are in days and represent when the
+drug was first marketed.
+
+The file NDC-substances-node-labels.txt maps the node IDs to the substances.
+
+The nth line in NDC-classes-simplex-labels.txt is the name of the drug
+corresponding to the nth simplex.