add readme and images

Author: marquesafonso

README.md

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+# node-mongodb-todo
+
+Part 1 of the <a href="https://codedamn.com/learn/node-mongodb-fundamentals">Learn MongoDB with Node.js</a> course from Codedamn. In this part a simple To Do app is created using Express.
+
+The installation and connection to a MongoDB database was the main issue address. A schema for this database was created using Mongoose.
+
+Additionally, a CRUD model was created to enable conversation between the frontend part of the application and the database.
+
+The pictures below depict the final working example:
+
+<div style="display:flex-center; flex-direction: row; justify-content: space-evenly;">
+  <img src="frontend.png"></img>
+  <img src="database.png"></img>
+</div>