Add Basa Jawa README & fix alphabetical order on CONTRIBUTING (#953)

* added basa jawa translation for CONTRIBUTING.md

* added basa jawa translation for CONTRIBUTING.md

* fixed alphabetical order on CONTRIBUTING.md and added Basa Jawa translation for README.md

* fix lint error

README.md

@@ -8,6 +8,7 @@
 🌐
 [Azerbaijani][AZ],
 [bahasa Indonesia][ID],
+[Basa Jawa][JV],
 [Català][CA],
 [Čeština][CZ],
 [Dansk][DA],
@@ -64,6 +65,7 @@
 [ID]:Translations/README.id.md
 [IT]:Translations/README.it.md
 [JA]:Translations/README.ja.md
+[JV]:Translations/README.jv.md
 [KO_KR]:Translations/README.ko_kr.md
 [KU]:Translations/README.ku.md
 [LT]:Translations/README.lt.md