Add README, screenshots

Author: Poitrin

LICENSE

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 MIT License
 
-Copyright (c) 2018 Julien Poitrin
+Copyright (c) 2018 Poitrin
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

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+# Covers app
+This app has been developed for musicians who …
+* know which instruments (synths, samples, …) have been used (or can be used) in a song (piece, …) and want to share this information with other musicians
+  * E.g. I know that the [synth sound of the intro of Coldplay’s song Hypnotised](https://www.youtube.com/watch?v=WXmTEyq5nXc) can be obtained from a [Yamaha keyboard, with the preset “Stardust”](https://www.youtube.com/watch?v=QwKxPuqxJvI).
+* play in a cover band and need to find sounds that are similar to the original sound
+  * E.g. I have a Yamaha Motif XF8 synth and my band wants to cover Bon Jovi’s _It’s my life_. Which sounds do I need to select (what do I need to configure) in order to be close to the original?
+
+## User Interface
+### List all creative works (songs, pieces, …)
+![List all creative works](https://raw.github.com/Poitrin/covers/master/doc/images/creative_work_list.png)
+
+### Create a new creative work
+![Create a new creative work](https://raw.github.com/Poitrin/covers/master/doc/images/creative_work_create.png)
+
+### Get sound suggestions of a specific song
+![Get sound suggestions of a specific song](https://raw.github.com/Poitrin/covers/master/doc/images/creative_work_show.png)
+
+## Installation
+(still needs to be written)
+
+## Testing
+(still needs to be written)
+
+## Design decisions
+(still needs to be written)
+
+## To do / ideas
+### General
+- [ ] Execute all tests via Travis CI (configure test DB, …)
+- [ ] Consistently use 2 spaces (instead of 4)
+- [ ] Convert source code TODOs into Github issues
+- [ ] Deploy the app so that it is public for all musicians in the world
+- [ ] Input boxes are maybe too small sometimes and should be replaced by a textarea
+- [ ] Admin login to approve incoming data
+- [ ] Edit or delete own information
+- [ ] Search functionality
+- [ ] Be able to add sources (e.g. forums, videos, …)
+- [ ] Generate documentation
+
+### Tests that need to be written
+- [ ] When no creative works have been created, the "New creative work" button should not be displayed twice
+- [ ] The current user should only see approved information (by an admin) or his / her own published information waiting for approval
+- [ ] Creative works, parts and suggestions should be correctly ordered by creation date (desc or asc)
+- [ ] Validation errors should be correctly displayed / translated