feat(utils/opatio): added python module for interfacing with opat files

A python module (opatio) has been written to make the creation and reading of opat files straight forward

utils/opatio/readme.md

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+# opatIO python module
+This module defines a set of tools to build, write, and read OPAT files. 
+The OPAT fileformat is a custom file format designed to efficiently store
+opacity information for a variety of compositions. 
+
+## Installation
+You can install this module with pip
+```bash
+git clone <repo>
+cd 4DSSE/utils/opat
+pip install .
+```
+
+## General Usage
+The general way that this module is mean to be used is to first build a schema for the opaticy table and then save that to disk. The module will handle all the byte aligment and lookup table construction for you. 
+
+A simple example might look like the following
+
+```python
+from opatio import OpatIO
+
+opacityFile = OpatIO()
+opacityFile.set_comment("This is a sample opacity file")
+opaticyFile.set_source("OPLIB")
+
+# some code to get a logR, logT, and logKappa table
+# where logKappa is of size (n,m) if logR is size n and
+# logT is size m
+
+opacityFile.add_table(X, Z, logR, logT, logKappa)
+opacityFile.save("opacity.opat")
+```
+
+You can also read opat files which have been generated with the loadOpat function
+
+```python
+from opatio import loadOpat
+
+opacityFile = loadOpat("opacity.opat")
+
+print(opacityFile.header)
+print(opaticyFile.tables[0])
+```
+
+## Problems
+If you have problems feel free to either submit an issue to the root github repo (tagged as utils/opatio) or email Emily Boudreaux at emily.boudreaux@dartmouth.edu