Add support for nerd font glyphs in languages info

CONTRIBUTING.md

@@ -48,6 +48,7 @@ CSharp: # required, this will be the name of the enum variant for the language a
       - "#803788"
       - "#FFFFFF"
     chip: "#178600" # required, this is used for the language breakdown bar, its value can be found in linguist (link 2).
+  icon: '\u{E648}' # optional, the UTF-16 code point of the nerd font icon if supported (link 3).
   serialization: c# # required only if the Enum name `CSharp` doesn't match the display name `C#`
 ```
 
@@ -60,6 +61,7 @@ CSharp: # required, this will be the name of the enum variant for the language a
 
 - link 1: https://github.com/XAMPPRocky/tokei#supported-languages
 - link 2: https://github.com/github/linguist/blob/master/lib/linguist/languages.yml
+- link 3: https://www.nerdfonts.com/cheat-sheet
 
 ### Adding translation for README.md