feat: Add support for installing specific packages without using -n flag

README.md

@@ -9,7 +9,7 @@ Easy way to install package for LInux Distributions<br>
 `ui config` show the config file of ui  
 `ui config -n {name} -u {URL}` set a source for a package  
 `ui install` download the package file in config file's list then install it.  
-`ui install -n {name}` download and install the specific package
+`ui install {name}` download and install the specific package
 
 # Installation
 ## Build from source
@@ -53,5 +53,5 @@ ui install
 
 **Step 3.** Install the specific package with package name in config
 ```bash
-ui install --name discord
+ui install discord
 ```