docs(README): update README

README.md

@@ -1,5 +1,13 @@
 # Zigfetch
 
+- [Description](#description)
+- [Requirements](#requirements)
+- [Installation](#installation)
+- [Usage](#usage)
+  - [Configuration](#configuration)
+- [Roadtrip](#roadtrip)
+- [Contributing](#contributing)
+
 ## Description
 
 Zigfetch is a minimal [neofetch](https://github.com/dylanaraps/neofetch)/[fastfetch](https://github.com/fastfetch-cli/fastfetch) like system information tool
@@ -21,7 +29,7 @@ $ cd path/to/zigfetch
 $ zig build -Doptimize=ReleaseSafe
 
 # Then move it somewhere in your $PATH. Here is an example:
-$ mv ./zig-out/zigfetch ~/bin
+$ mv ./zig-out/zigfetch ~/bin/
 ```
 
 ## Usage
@@ -30,12 +38,36 @@ $ mv ./zig-out/zigfetch ~/bin
 $ zigfetch
 ```
 
+### Configuration
+
+> [!IMPORTANT]
+> Currently, Zig does not have a built-in library for JSON validation via JSON schema, so it is very important to follow the pattern shown in the default configuration file ([config.json]()) to avoid errors
+
+- Create the config folder
+
+```console
+$ mkdir -p ~/.config/zigfetch
+```
+
+- Create the config file
+
+```console
+$ cd ~/.config/zigfetch
+$ touch config.json
+```
+
+- Or copy the default config (preferred way)
+
+```console
+$ cp /path/to/zigfetch/config.json ~/.config/zigfetch/config.json
+```
+
 ## Roadtrip
 
 - [ ] Add ASCII art for each operating system and Linux distro
 - [ ] Add GPU info for Linux
 - [ ] Add packages info for Linux
-- [ ] Add user customization
+- [x] Add user customization
 
 ## Contributing
 If you would like to contribute to this project just create a pull request which I will try to review as soon as possible.