parsers: add tree-sitter-slang

queries/slang/highlights.scm

@@ -0,0 +1,42 @@
+; inherits: hlsl
+
+[
+ "var"
+ "let"
+ "This"
+] @type.builtin
+
+[
+ "interface"
+ "extension"
+ "property"
+] @keyword 
+
+[
+ "__init"
+] @constructor
+
+[
+ "__subscript"
+ "get"
+ "set"
+] @function.builtin
+
+(interface_requirements (identifier) @type)
+
+(binary_expression
+  ["is" "as"]
+  right: (identifier) @type)
+
+[
+ "as"
+ "is"
+] @keyword.operator
+
+[
+ "__exported"
+ "import"
+] @include
+
+(property_declaration
+  (identifier) @property)