Add challenge description

README.md

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-# django-challenge
+# django-challenge
+
+
+The volleyball Federation decided to use an online selling platform for the next season, and our company has been chosen for implementing that.
+
+# Requirements
+
+Our system should have REST APIs for the following tasks:
+
+- User signup and login
+- Adding a new stadium
+- Defining matches
+- Defining the place of seats for each match
+- Buying seats of a match (There is no need for using a payment gateway)
+
+# Implementation details
+
+We don't need a GUI for this system. You can use the Django admin.
+Try to write your code as **reusable** and **readable** as possible. Also, don't forget to **document your code** and clear the reasons for all your decisions in the code.
+Using API documentation tools is a plus.
+Don't forget that many people trying to buy tickets for a match. So try to implement your code in a way that could handle the load. If your solution is not sample enough for implementing fast, you can just describe it in your documents.
+
+Please fork this repository and add your code to that. Don't forget that your commits are so important. So be sure that you're committing your code often with a proper commit message.