Rewrote README, wrote building guides and cleaned up

- Updated/prettified README.md
- Wrote extensive building guides
- Removed pictures/
- Removed music samples
- Made sure that git creates run/ when cloning

.gitignore

@@ -16,7 +16,12 @@ bin
 # Ignore MacOS
 **/.DS_Store
 .idea/
-run/
+
+# Ignore the dedicated working directory
+run/*
+
+# ... Except the dummy file inside to make sure that the directory exists
+!run/.dummy
 
 # Ignore package building artifacts
 build_packages/*