Provide IntelliJ setup instructions

doc/Setup.md

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+
+# Setup
+
+## Install IntelliJ
+
+[Create a Jet Brains academic account](https://www.jetbrains.com/shop/eform/students) and follow the instructions
+in these short videos to download and install IntelliJ IDEA Ultimate (which we will just call IntelliJ) and JDK 21.
+
+### Download and Install
+You can download IntelliJ from [https://jetbrains.com/idea](https://jetbrains.com/idea).
+
+Video instructions:
+
+* [Windows download and installation](https://northeastern.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=b58332f0-d512-40a5-9097-b0ed001eaf95&start=0)
+* [Mac download](https://northeastern.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=a2dde07b-bf3e-43af-b64f-b0e4010de83a&start=0)
+and [installation](https://northeastern.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=05f9e00f-ffc2-4233-b18c-b0ed00362ac8&start=0)
+
+### Add License
+
+[Video instructions](https://northeastern.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=e2656560-4711-4fc5-8f43-b0ed0051931f&start=0)
+
+If you get a message that there are no available licenses, open your browser to 
+[https://account.jetbrains.com/licenses](https://account.jetbrains.com/licenses),  where you should see:
+
+![image](https://github.com/jacquard-autograder/jacquard/assets/661056/a44d96a2-dfb1-417e-85d2-6b4bac2c0278)
+
+Click on the link labeled [Apply for a free student or teacher 
+license](https://www.jetbrains.com/student), and follow the instructions there. 
+
+### Install JDK 21
+
+[Video instructions](https://northeastern.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=edc1d4ac-0f28-4e44-b14a-b0ed005186c1&start=0)