Improve README.md

Author: EtiamNullam

README.md

@@ -4,16 +4,40 @@ This simple syntax for vim allows for easy creation of simple TODO files.
 
 ![Preview](Images/Preview.jpg)
 
-Whitespaces don't matter and tabulation can be useful for tree-like structure:
+Start a line with one of these characters for to highlight it with various colors:
+| Character | Highlight Group |
+| --- | --------- |
+| `-` | Type      |
+| `+` | Statement |
+| `!` | Special   |
+| `?` | Constant  |
+| `/` | Comment   |
+
+
+Whitespaces don't matter and indentation can be useful to create a tree-like structure:
 
 ![Whitespaces don't matter](Images/Whitespaces.jpg)
 
+All examples are shown in solarized light color palette. Colors depends on your color scheme.
+
 ## Installation
 
-Move `todotxt.vim` to `~/vimfiles/syntax` (Windows) or `~/.vim/syntax` (Unix)
+<details>
+  <summary>Use your plugin manager (recommended)</summary>
 
-Also make sure that syntax is enabled in your `vimrc` file by `syntax enable`
+  For example using [vim-plug](https://github.com/junegunn/vim-plug):
 
-[More info about syntax files](https://vim.wikia.com/wiki/Creating_your_own_syntax_files)
+  ```viml
+  Plug 'EtiamNullam/vim-todotxt-syntax'
+  ```
+</details>
 
-All examples are shown in solarized light color palette. Unfortunately, right now colors will be off in other color schemes.
+<details>
+  <summary>Manual</summary>
+
+  Move `todotxt.vim` to `~/vimfiles/syntax` (Windows) or `~/.vim/syntax` (Unix)
+</details>
+
+Also make sure that syntax is enabled in your config by `syntax enable`
+
+[More info about syntax files](https://vim.wikia.com/wiki/Creating_your_own_syntax_files)