added more READMEs

Author: kosack

Preparation/README.md

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+Data Preparation
+================
+
+Notebooks to generate processed data needed for the benchmarks. These
+should produce e.g. DL1, DL2, or DL3 data products that are
+subsequently loaded by the benchmark notebooks in `Benchmarks/`.  The
+output data files *should not be included in this git repository*,
+only the code necessary to generate them.  All outputs should be
+stored in a dedicated storage directory on the machine executing the
+notebooks.

Summaries/README.md

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+Summaries
+=========
+
+Notebooks for collecting and summarizing benchmarks.