readme

Author: Deian Stefan

README.md

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+## Homework task
+
+Modify `lib/eval.js` to implement the free variables, substitution,
+and normalize functions
+
+
+## How to run the code
+
+The main file for the project is `index.js`. This is a program that
+simply takes a filepath as an argument and runs the code in that file.
+The input file is expected to have 1 term per line.
+
+```bash
+node index.js example.lc
+```