Add sample graphs and documentation about accepted inputs

sampleGraphs/README.md

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+miniTri is a simple, triangle-based data analytics code.  miniTri is a miniapp
+in the Mantevo project (http://www.mantevo.org) at Sandia National Laboratories
+The primary authors of miniTri are Jon Berry and Michael Wolf ([email protected]).
+
+miniTri v. 1.0. Copyright (2016) Sandia Corporation.
+
+For questions, contact Jon Berry ([email protected]) or Michael Wolf ([email protected]).
+
+Please read the accompanying README and LICENSE files.
+
+------------------------------------------------
+sampleGraphs:
+------------------------------------------------
+
+The `sampleGraphs` directory contains two sample graphs in the [Matrix Market](https://math.nist.gov/MatrixMarket/formats.html) (MM) format.
+
+
+Ensure that the provided graphs comply with the following characteristics:
+
+- The matrix must be in MM or BIN format.
+- The number of rows and columns must be equal.
+- Complex matrices are not supported.
+
+Please adhere to these requirements when providing input graphs to the software.

sampleGraphs/chesapeake.mtx

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+%%MatrixMarket matrix coordinate pattern symmetric
+%-------------------------------------------------------------------------------
+% UF Sparse Matrix Collection, Tim Davis
+% http://www.cise.ufl.edu/research/sparse/matrices/DIMACS10/chesapeake
+% name: DIMACS10/chesapeake
+% [DIMACS10 set: clustering/chesapeake]
+% id: 2457
+% date: 2011
+% author: unknown
+% ed: H. Meyerhenke
+% fields: name title A id date author ed kind notes
+% kind: undirected graph
+%-------------------------------------------------------------------------------
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