Add README

Author: paulodder

README.md

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+# Getting started
+
+Install requirements see (`requirements.txt`)
+Set PROJECT\\<sub>DIR</sub> to the path to the directory of this repo in `.env`
+
+
+# Usage
+
+
+## Generating expressions
+
+In order to **generate** expressions for a given set of settings, use
+`src/generate_expressions.py`
+
+    python src/generate_expressions.py  --max_model_size 9 --max_expression_length 8 --json_setup Logical_index.json
+
+The script will store the results under $PROJECT<sub>DIR</sub>/results/ by default.