Update README.md

Author: vinceliuice

README.md

@@ -1,16 +1,31 @@
 ## Vimix Icon Theme
-    A Material Design icon theme
+
+A Material Design icon theme
 
 Vimix icon theme is based on Paper-Icon-Theme: https://github.com/snwh/paper-icon-theme
 
 ## Install Or Uninstall
-Run
+```
+Usage: ./install.sh [OPTIONS...] [COLOR VARIANTS...]
+
+OPTIONS:
+  -a                       Install all color folder versions
+  -d DIR                   Specify theme destination directory (Default: /home/liuice/.local/share/icons)
+  -n NAME                  Specify theme name (Default: )
+  -h                       Show this help
 
-    ./install.sh
-## Install with all color variants
-    ./install.sh -a
+COLOR VARIANTS:
+  standard                 Standard color folder version
+  Amethyst                 Purple color folder version
+  Beryl                    Teal color folder version
+  Doder                    Blue color folder version
+  Ruby                     Red color folder version
+  Jade                     Green color folder version
+  Black                    Black color folder version
+  White                    White color folder version
 
-Or double-click to open that script files and select "run at the terminal" at nautilus.
+  By default, only the standard one is selected.
+```
 
 ## Preview
 ![1](../master/Preview.png)