Add elm TS queries, fixes #167

after/queries/elm/matchup.scm

@@ -0,0 +1,16 @@
+(if_else_expr
+   . "if" @open.if) @scope.if
+
+(if_else_expr
+   "else" @_else
+   "if"? @_if
+   (#make-range! "mid.if.1" @_else @_if))
+
+(let_in_expr
+  "let" @open.let
+  "in" @mid.let.1) @scope.let
+
+(case_of_expr
+  (case) @open.case
+  (case_of_branch
+     (arrow) @mid.case.1)) @scope.case