Added highlights.scm and tests.mzn

runtime/queries/minizinc/highlights.scm

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+; Function calls
+(call
+  function: (identifier) @function)
+
+; Function definitions
+(function_item
+  name: (identifier) @function)
+
+(predicate
+  name: (identifier) @function)
+
+; Types
+(primitive_type) @type.builtin
+
+[
+  "array"
+  "of"
+  "par"
+  "set"
+  "var"
+] @type.builtin
+
+; Identifiers
+(identifier) @variable
+
+; Keywords
+[
+  "annotation"
+  "constraint"
+  "else"
+  "elseif"
+  "endif"
+  "enum"
+  "function"
+  "if"
+  "include"
+  "let"
+  "maximize"
+  "minimize"
+  "output"
+  "predicate"
+  "satisfy"
+  "solve"
+  "test"
+  "then"
+  "where"
+] @keyword
+
+; Operators
+[
+  "<->"
+  "->"
+  "<-"
+  "\\/"
+  "xor"
+  "/\\"
+  "="
+  "=="
+  "!="
+  "<"
+  "<="
+  ">"
+  ">="
+  "in"
+  "subset"
+  "superset"
+  "union"
+  "diff"
+  "symdiff"
+  "intersect"
+  ".."
+  "+"
+  "-"
+  "++"
+  "*"
+  "/"
+  "div"
+  "mod"
+  "^"
+  "::"
+] @operator
+
+; Punctuation
+[
+  ","
+  ":"
+  ";"
+  "|"
+] @punctuation.delimiter
+
+[
+  "("
+  ")"
+  "["
+  "]"
+  "{"
+  "}"
+] @punctuation.bracket
+
+; Literals
+[
+  (integer_literal)
+  (float_literal)
+] @number
+
+[
+  (string_literal)
+  (string_interpolation)
+] @string
+
+[
+  (escape_sequence)
+  (escape_interpolation)
+] @string.escape
+
+[
+  (absent)
+  (boolean_literal)
+] @constant.builtin
+
+; Comments
+[
+  (block_comment)
+  (line_comment)
+] @comment

tests/query/highlights/minizinc/test.mzn

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+% include "data.dzn";
+% ^^^^^^^ @keyword.directive
+%         ^^^^^^^^^^ @string
+%                   ^ @punctuation.delimiter
+
+var 1..10: x;
+% ^^^ @keyword
+%   ^ @number
+%    ^^ @operator
+%      ^^ @number
+%        ^ @punctuation.delimiter
+%          ^ @variable
+%           ^ @punctuation.delimiter