update user guide and readme (nusCS2113-AY1920S1#34)

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README.adoc

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+= Duchess
+![alt text](https://github.com/AY1920S1-CS2113T-T09-2/main/blob/master/docs/images/Ui.PNG)
+
+* Duchess is a calendar application tailor-made for NUS students. 
+* It provides an interface for students to manage both their school and extra-curriculum commitments while providing academic contextual information.
+* User interactions happen using a Command Line Interface.
+
+== Site Map
+* https://github.com/AY1920S1-CS2113T-T09-2/main/blob/master/docs/UserGuide.adoc[User Guide^]
+* https://github.com/AY1920S1-CS2113T-T09-2/main/blob/master/docs/AboutUs.adoc[Developer Guide^]
+* https://github.com/AY1920S1-CS2113T-T09-2/main/blob/master/docs/AboutUs.adoc[About Us^]
+* https://github.com/AY1920S1-CS2113T-T09-2/main/blob/master/docs/ContactUs.adoc[Contact Us^]
+
+== Acknowledgements
+* This application is a morph of the CS2113 Duke application.
+* Libraries used:

docs/AboutUs.adoc

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 = About Us
 :imagesDir: images
-////
 :site-section: AboutUs
-:relfileprefix: team/
-:stylesDir: stylesheets
-////
 
 Duchess was developed by the T09-2 Team. +
 We are a Chess team based in the http://www.comp.nus.edu.sg[School of Computing, National University of Singapore].

docs/ContactUs.adoc

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+= Contact Us
+:site-section: ContactUs
+:stylesDir: stylesheets
+
+* *Bug reports, Suggestions* : Post in our https://github.com/AY1920S1-CS2113T-T09-2/main/issues[issue tracker] if you noticed bugs or have suggestions on how to improve.
+* *Contributing* : We welcome pull requests. Follow the process described https://github.com/oss-generic/process[here]