Move content from README to course-details

Author: crichID

course-details.md

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+## Welcome to React!
+
+Congratulations on taking some of your first steps into full stack development! 
+
+So why did you decide to click and join this course? Ideally, you are a learner who:
+
+- Understands HTML tags
+- Understands classes and methods in Javascript
+- Understands git and GitHub
+
+If you understand the topics above, you can start learning modern frontend development with React!
+
+So why do we learn React?
+
+React has growing popularity in the tech industry because of its simplicity. With a simple knowledge of HTML and Javascript, picking up React shouldn't be too bad.
+
+### What we will be building
+
+So what are we going to be building today? We are going to build a gradebook for teachers! Take a look at [our solution](https://githubtraining.github.io/react-solution/). Here's what the finished app looks like.
+
+You will be able to add assignments
+![Finished Assignments](https://user-images.githubusercontent.com/25253905/61293228-11f26580-a788-11e9-90ac-9612c2bddf6b.png)
+
+You will be able to add students
+![Finished Students](https://user-images.githubusercontent.com/25253905/61293769-46b2ec80-a789-11e9-88b3-c660f436f5bf.png)
+
+
+You will be able to assign grades to those students for each assignment
+![Finished Grades](https://user-images.githubusercontent.com/25253905/61295315-9810ab00-a78c-11e9-8bcb-f3e3bb87b2be.png)
+
+### Steps
+Go ahead and join the course!