Add the README file

Author: WangNianyi2001

.gitignore

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 # Project
 /*
+!/README.md
 !/Team Log
 !/Back and Forth
 !/Torii

README.md

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+# GSND 5110 GP3: Classroom 404
+
+This is a first-person puzzle game as course project made by Nian'yi and Sadaf, namely _The Duo_.
+
+The link to the assignment on Canvas is [here](https://northeastern.instructure.com/courses/193724/assignments/2369569).
+
+## Links
+
+Due to the difficulty we encountered when trying to submit the PDF of the concept document on Canvas, we decided to put the links to all the required materials here:
+
+- [GitHub](https://github.com/Nianyi-GSND-Projects/GSND-5110-GP3)
+- [Releases](https://github.com/Nianyi-GSND-Projects/GSND-5110-GP3/releases)
+- [itch.io](https://nianyi-wang.itch.io/classroom-404)
+- [Playthrough Video](https://www.youtube.com/watch?v=8zsTWFdrohA)
+- [Playtest Document](https://github.com/Nianyi-GSND-Projects/GSND-5110-GP3/blob/master/Playtest%20Doc/Playtest%20Doc.pdf)
+- [Trello](https://trello.com/invite/b/672edd5f7abed9fb9f9fa34c/ATTI5d6206837aa4d4bc65d880d861dc1842BA71A0AA/gsnd-5110-gp3-the-duo)
+- [Team Log](https://github.com/Nianyi-GSND-Projects/GSND-5110-GP3/blob/master/Team%20Log/Team%20Log.md)