Add node modules and compiled JavaScript from main (#172)

Co-authored-by: Oliver King <oking3@uncc.edu>

node_modules/underscore/cjs/isNaN.js

@@ -0,0 +1,9 @@
+var _setup = require('./_setup.js');
+var isNumber = require('./isNumber.js');
+
+// Is the given value `NaN`?
+function isNaN(obj) {
+  return isNumber(obj) && _setup._isNaN(obj);
+}
+
+module.exports = isNaN;