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

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

node_modules/underscore/modules/constant.js

@@ -0,0 +1,6 @@
+// Predicate-generating function. Often useful outside of Underscore.
+export default function constant(value) {
+  return function() {
+    return value;
+  };
+}