Add support for Vue files

I haven't included parsing the `style` tag, since the only applicable
queries we have are CSS (which actually works fine for SCSS too).

queries/vue/highlights.scm

@@ -0,0 +1,38 @@
+[
+  (component)
+  (template_element)
+  (start_tag)
+  (tag_name)
+  (directive_attribute)
+  (directive_dynamic_argument)
+  (directive_dynamic_argument_value)
+  (component)
+  (end_tag)
+] @tag
+
+(erroneous_end_tag_name) @error
+(attribute_name) @property
+(attribute_value) @string
+(quoted_attribute_value) @string
+(comment) @comment
+
+(text) @none
+(element) @string
+(interpolation) @punctuation.special
+(interpolation
+  (raw_text) @none)
+
+[
+  (directive_modifier)
+  (directive_name)
+  (directive_argument)
+] @method
+
+"=" @operator
+
+[
+ "<"
+ ">"
+ "</"
+ "/>"
+ ] @tag.delimiter

queries/vue/injections.scm

@@ -0,0 +1,19 @@
+((style_element
+  (raw_text) @css))
+
+; There's no queries for less, sass nor postcss.
+
+((script_element
+  (raw_text) @javascript))
+
+(
+  (script_element
+    (start_tag
+      (attribute
+        (quoted_attribute_value (attribute_value) @_lang)))
+    (raw_text) @typescript)
+  (#match? @_lang "(ts|typescript)")
+)
+
+((interpolation
+  (raw_text) @javascript))