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

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

node_modules/underscore/modules/_isBufferLike.js

@@ -0,0 +1,6 @@
+import createSizePropertyCheck from './_createSizePropertyCheck.js';
+import getByteLength from './_getByteLength.js';
+
+// Internal helper to determine whether we should spend extensive checks against
+// `ArrayBuffer` et al.
+export default createSizePropertyCheck(getByteLength);