Added is_type function

Signed-off-by: Victor Moene <[email protected]>

reference/functions/is_type.markdown

@@ -0,0 +1,30 @@
+---
+layout: default
+title: type
+published: true
+---
+
+[%CFEngine_function_prototype(var, type)%]
+
+**Description:** Returns whether a variable `var` is of type `type`
+
+[%CFEngine_function_attributes(var, type)%]
+
+This function works by comparing the type description of `var` with the string `type`. The function
+expects a variable identifier as the first argument `var` and a type string as
+the second argument `type`. The type accepts both the type and an optional subtype. The function
+by default evaluates to false if the variable or the type string are wrong.
+
+To see the possible data types and theit subtypes, see `type()`
+
+**Example:**
+
+[%CFEngine_include_snippet(is_type.cf, #\+begin_src cfengine3, .*end_src)%]
+
+Output:
+
+[%CFEngine_include_snippet(is_type.cf, #\+begin_src\s+example_output\s*, .*end_src)%]
+
+**History:**
+
+* Introduced in 3.26.0