Adding test files to data/

Author: SaishaKamat

data/README.md

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+# FaultyRank test dataset
+
+We are providing a very simple and pre-built graph to test FaultyRank.
+
+# Directory Structure
+
+```
+data/test_graph.txt: a prebuild graph. 
+data/test_unfilled.txt: @todo
+```
+
+@todo: explain what are weighted nodes in 1 sentence.
+@todo: explain what is unfilled node and how it is used to identify weighted nodes.
+
+## Experiment Overview
+@todo

data/test_graph.txt

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+0 2
+1 0
+2 0
+2 3
+3 2

data/test_unfilled.txt

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+0