Add (very) short README

README.md

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+# Nix/Guix Substitution Efficiency Benchmark
+
+This benchmark consists in a data acquisition part (`./compareSubsEfficiency`) and a data processing part consisting in a Jupyter Notebook (`./analysis-notebook/Analysis.ipynb`).
+
+You can perform the data acquisition with:
+
+```sh
+./compareSubsEfficiency analysis-notebook/bench-results
+```
+
+You can perform the data processing with:
+
+```sh
+cd analysis-notebook
+nix-shell
+jupyter-lab
+```