Update README

README.md

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 # noice
+
 A fork of noice file browser: http://git.2f30.org/noice/
+
+Added some customizations to make it more friendly towards major distros.
+
+## Modifications
+
+- File associations
+    - Associate mime 'text/plain' with vim (using libmagic)
+    - Associate video files with mpv
+    - Associate common audio file types with fmedia (http://fmedia.firmdev.com/)
+    - Associate PDF files with zathura
+    - Removed less
+    - Use xdg-open to open other files
+- Compilation
+    - Use `-O3` for compilation, fixed warnings
+    - Added compilation flag `-march=native` (compile only, no plans to package).
+    - Remove generated config.h on `make clean`.
+
+## Installation
+
+    $ make
+    $ sudo make install
+
+## Help
+
+    $ man noice