Add remove option and fixed install issues

Added EndeavourOS icon

README.md

@@ -1,20 +1,54 @@
+```
+  ____ ____  _   _ ____ ____    _____ _   _ _____ __  __ _____ ____
+ / ___|  _ \| | | | __ )___ \  |_   _| | | | ____|  \/  | ____/ ___|
+| |  _| |_) | | | |  _ \ __) |   | | | |_| |  _| | |\/| |  _| \___ \
+| |_| |  _ <| |_| | |_) / __/    | | |  _  | |___| |  | | |___ ___) |
+ \____|_| \_\\___/|____/_____|   |_| |_| |_|_____|_|  |_|_____|____/
 
-## Grub2 Themes
+```
 
-Vimix and StylishDark is a flat Design theme for Grub2.
+## Flat Design themes for Grub2.
 
 ## Install
 
-Double-click to open that script file,
-OrOpen the terminal at current directory.
+Usage:  `sudo ./install.sh`  **[OPTIONS...]**
 
-Run
+*if no option used the terminal user interface will be show up*
 
-    sudo ./Install
+|  OPTIONS:      | |
+|:---------------|:-------------|
+| -v, --vimix    | Vimix grub theme |
+| -s, --stylish  | Stylish grub theme |
+| -t, --tela     | Tela grub theme |
+| -l, --slaze    | Slaze grub theme |
+| -2, --2k       | Install 2k(2560x1440) background image |
+| -4, --4k       | Install 4k(3840x2160) background image |
+| -r, --remove   | Remove theme (must add theme name option) |
+| -h, --help     | Show this help |
 
-Or use Root user run ./Install
+For example:
+1. `Install Tela theme on 2k display device`
+
+    sudo ./install.sh -t -2
+
+2. `Remove Tela theme`
+
+    sudo ./install.sh -r -t
 
 ## Screenshots
-![01](https://github.com/vinceliuice/grub2-themes/blob/master/screenshot-vimix.jpeg?raw=true) 
-![02](https://github.com/vinceliuice/grub2-themes/blob/master/screenshot-stylish.jpeg?raw=true) 
 
+### Vimix grub theme
+
+![01](https://github.com/vinceliuice/grub2-themes/blob/master/screenshots/grub-theme-vimix.jpg?raw=true)
+
+### Stylish grub theme
+
+![02](https://github.com/vinceliuice/grub2-themes/blob/master/screenshots/grub-theme-stylish.jpg?raw=true)
+
+### Tela grub theme
+
+![03](https://github.com/vinceliuice/grub2-themes/blob/master/screenshots/grub-theme-tela.jpg?raw=true)
+
+### Slaze grub theme
+
+![04](https://github.com/vinceliuice/grub2-themes/blob/master/screenshots/grub-theme-slaze.jpg?raw=true)