Added instruction for concatenation.

README.md

@@ -7,12 +7,14 @@ Compress js and css files for your application.
 
 	php minify -t css -f "tests/css/style.css" -o min
 	php minify -t js -f "tests/js/test.js" -o min
+	php minify -c -t css -f "tests/css/reset.css tests/css/style.css" -o min
 
 ## Arguments:
 
 * `-t` - Type of asset. (js or css)
 * `-f` - List of files. Example: `-f "js/main.js js/plugin.js"`
 * `-o` - Output Directory. Example: `-o minfolder`
+* `-c` - Concatenate all files. File is written to output directory as min.css or min.js, respectively.
 
 **Note: Output files are named the same as the original.**