Add extracted source directory and README navigation

extracted-source/node_modules/json-bigint/index.js

@@ -0,0 +1,12 @@
+var json_stringify = require('./lib/stringify.js').stringify;
+var json_parse     = require('./lib/parse.js');
+
+module.exports = function(options) {
+    return  {
+        parse: json_parse(options),
+        stringify: json_stringify
+    }
+};
+//create the default method members with no options applied for backwards compatibility
+module.exports.parse = json_parse();
+module.exports.stringify = json_stringify;