Add Solidity

Author: jllopes

src/main/scala/com/codacy/plugins/api/languages/Language.scala

@@ -120,6 +120,7 @@ object Languages {
                                Julia,
                                Kotlin,
                                Powershell,
+                               Solidity,
                                OCaml)
 
   // Support startdate: always
@@ -273,4 +274,6 @@ object Languages {
 
   case object OCaml extends Language(extensions = Set(".ml", ".mli", ".mly", ".mll"))
 
+  case object Solidity extends Language(extensions = Set(".sol"))
+
 }