Create README.md

Author: hahasdnu1029

README.md

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+# CourseEval
+一个课程评估网站，操作如下：
+* Setup a Cloud9 environment for the course.
+* In your Cloud9 terminal, type the following command to clone the repository to your development workspace:
+* Then cd rottenpotatoes-rails-intro to change to the app's directory.
+* Run the command bundle install --without production to make sure all the gems (libraries) used by the app are in place.
+* Run bundle exec rake db:setup to create the initial database.
+* Run rails server -p $PORT -b $IP to start the app. Cloud9 will pop up a window showing the URL to visit in your browser to interact with the running app.