feat: add PlanetLab example

Signed-off-by: Stephen Waits <steve@waits.net>

examples/NetLatency-Data/README.md

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+# Network Latency Datasets
+
+This repository consists datasets of network latencies which we collected from two public network platforms: `PlanetLab` and `Seattle`. Please feel free to contact us if you have any comments or questions.
+
+---
+
+### Seattle Dataset
+
+**688 time slices of RTTs between 99 nodes in the Seattle network**
+
+This dataset consists of round trip times (RTTs) between 99 nodes in the Seattle network over 688 time slices.
+
+The file name of each frame is as the format `SeattleData_t`, where `t` is the number of the time slice for this frame. The number `t` ranges from 1 to 688. Each file is a 99x99 matrix, where the (*i*, *j*)-th entry indicates the measured RTT from node *i* to node *j*.
+
+
+### PlanetLab Dataset
+
+**18 time slices of RTTs between 490 nodes in the PlanetLab network**
+
+This dataset consists of round trip times (RTTs) between 490 nodes in the PlanetLab network over 18 time slices.
+
+The file name of each frame is as the format `PlanetLabData_t`, where `t` is the number of the time slice for this frame. The number `t` ranges from 1 to 18. Each file is a 490x490 matrix, where the (*i*, *j*)-th entry indicates the measured RTT from node *i* to node *j*.
+
+
+---
+
+## Citation
+
+IF YOU USE THIS PACKAGE IN ANY PUBLISHED RESEARCH, PLEASE KINDLY CITE THE FOLLOWING PAPER:
+
+Rui Zhu, Bang Liu, Di Niu, Zongpeng Li, Hong Vicky Zhao, "Network Latency Estimation for Personal Devices: A Matrix Completion Approach", IEEE/ACM Transactions on Networking, vol. 25, no. , pp. 724-737, April 2017.
+
+## Acknowledgements
+- Seattle (https://seattle.poly.edu/) for use to collect the dataset
+- PlanetLab (http://www.planet-lab.org/) for use to collect the dataset
+
+## License
+The MIT License (MIT)
+