Add node modules and compiled JavaScript from main (#54)

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

node_modules/underscore/modules/_getLength.js

@@ -0,0 +1,4 @@
+import shallowProperty from './_shallowProperty.js';
+
+// Internal helper to obtain the `length` property of an object.
+export default shallowProperty('length');