[doc] add supported languages

README.md

@@ -27,3 +27,15 @@ All options :
                                        ja, ko, es]
     -o, --output-file <output-file>    Output file, stdout if not present
     -w, --word-count <word-count>      Word count [default: 9]  [possible values: 9, 12, 15, 18, 21, 24]
+
+## Supported languages
+
+| Language | code |
+|:-|:-|
+| English | en |
+| Italian  | fr |
+| Spanish  | es |
+| Japanese  | ja |
+| Korean  | ko |
+| ChineseSimplified  | zh_HANS |
+| ChineseTraditional  | zh_HANT |