Add README

Author: bechang

README.md

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+# hw02
+
+This repository contains some minimal starter files for Homework Assignment 2.
+
+```
+.
+├── Makefile            a minimal Makefile for your convenience
+├── hw02-student.pdf    built from hw02-student.tex
+├── hw02-student.tex    a LaTeX template for your submission (if you wish)
+├── hw02.pdf            assignment handout
+└── ocaml               lab files
+```
+
+Please make sure you have built the `pdf` from your `tex` file for your final submission.

ocaml/README.md

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+# hw02/ocaml
+
+This repository contains some minimal OCaml starter files for Homework Assignment 2.
+
+```
+.
+├── hw02.ml       a template for your submission (if you wish)
+├── hw02.sh       a minimal script to run tests
+└── test_hw02.ml  a template for your tests (if you wish)
+```
+
+1 directory, 6 files
+
+## Dependencies
+
+First, make sure you have `ocaml` and `opam` installed from your system's package manager. Then, you can install the build and library dependencies as follows:
+
+```
+opam install dune base ounit2
+```
+
+## Build and Run Tests
+
+You can build and run tests as follows:
+
+```
+dune runtest
+```
+
+Or, the simple top-level script
+
+```
+./hw02.sh
+```
+
+simply calls the above.