Add chat app readme

chat-app/README.md

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+# Write and Deploy Chat Application Frontend and Backend
+
+### Link to the coursework
+
+https://sdc.codeyourfuture.io/decomposition/sprints/2/prep/
+
+You must complete and deploy a chat application. You have two weeks to complete this.
+
+It must support at least the following requirements:
+* As a user, I can send add a message to the chat.
+* As a user, when I open the chat I see the messages that have been sent by any user.
+* As a user, when someone sends a message, it gets added to what I see.
+
+It must also support at least one additional feature.
+
+### Why are we doing this?
+
+Learning about deploying multiple pieces of software that interact.
+
+Designing and implementing working software that users can use.
+
+Exploring and understanding different ways of sending information between a client and server.
+
+### Maximum time in hours
+
+16
+
+### How to submit
+
+* Fork the Module-Decomposition repository
+* Develop and deploy your chat app
+* Create a pull request back into the original Module-Decomposition repo, including:
+    * A link to the deployed frontend on the CYF hosting environment
+    * A link to the deployed backend on the CYF hosting environment