Update README.md (#211)

README.md

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 # Thicket
 
-A Python-based toolkit for analyzing ensemble performance data. You can find
-detailed documentation, along with tutorials of Thicket in the
+A Python-based toolkit for Exploratory Data Analysis (EDA) of parallel performance data
+that enables performance optimization and understanding of applications’ performance on
+supercomputers. It bridges the performance tool gap between being able to consider only
+a single instance of a simulation run (e.g., single platform, single measurement tool,
+or single scale) and finding actionable insights in multi-dimensional, multi-scale,
+multi-architecture, and multi-tool performance datasets. You can find detailed
+documentation, along with tutorials of Thicket in the
 [ReadtheDocs](https://thicket.readthedocs.io/en/latest/).
 
 ### Installation