added data.txt

L3/Data.txt

+Describe the layout of the data and how it was organized.
+- The layout of the data starts with <name> and ends with </name>
+What output format did you choose?  Why?
+- I used xml because it is the default format that is offered and it makes sense to me.
+How many Americans had at least a bachelor’s degree in Dec 2011, Dec 2012, and Dec 2013?
+- Dec 2011: 77,847,105. Dec 2012: 78,925,852. Dec 2013: 79,784,992
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