Create README.md

Author: Nikhil Kumar

codegens/nodejs-superagent/README.md

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+# codegen-nodejs-superagent
+
+> Converts Postman-SDK Request into code snippet for NodeJS-superagent.
+
+
+#### Prerequisites
+To run the module, ensure that you have NodeJS with superagent as a dependency. A copy of the NodeJS installable can be downloaded from https://nodejs.org/en/download/package-manager.