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

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

node_modules/underscore/cjs/_getLength.js

@@ -0,0 +1,6 @@
+var _shallowProperty = require('./_shallowProperty.js');
+
+// Internal helper to obtain the `length` property of an object.
+var getLength = _shallowProperty('length');
+
+module.exports = getLength;