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

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

node_modules/underscore/modules/findLastIndex.js

@@ -0,0 +1,4 @@
+import createPredicateIndexFinder from './_createPredicateIndexFinder.js';
+
+// Returns the last index on an array-like that passes a truth test.
+export default createPredicateIndexFinder(-1);