add outro

Author: osamaakb

module3-crud-and-data-models/r5-outro/README.md

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+## Conclusion
+
+We learned a bit about creating a good database schema, then dived into CRUD requests with mongoose and how to create a RESTful api, we also touched on folder structure using the MVC design pattern, finally, we learned about creating custom methods in mongoose.
+With that being said, now you should be able to build a well structured back-end application with NodeJS, express, and mongoose for better MongoDB models.
+But you are still missing one of the big pillars in back-end development, and that is **authentication**! Which you are going to learn in the next module.