doc: Added workload group example documentation

docs/data-sources/zia_workload_groups.md

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+---
+subcategory: "Workload Groups"
+layout: "zscaler"
+page_title: "ZIA: workload_groups"
+description: |-
+  Get information about Workload Groups.
+---
+
+# Data Source: zia_workload_groups
+
+Use the **zia_workload_groups** data source to get information about Workload Groups in the Zscaler Internet Access cloud or via the API. This data source can then be used as a criterion in ZIA policies such as, Firewall Filtering, URL Filtering, and Data Loss Prevention (DLP) to apply security policies to the workload traffic.
+
+## Example Usage
+
+```hcl
+# ZIA Admin User Data Source
+data "zia_workload_groups" "ios"{
+    name = "Example"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `name` - (Required) The name of the workload group to be exported.
+* `id` - (Optional) The unique identifer for the workload group.
+
+## Attribute Reference
+
+In addition to all arguments above, the following attributes are exported:
+
+* `description` - (String) The description of the workload group.
+* `expression_json` - (List) The workload group expression containing tag types, tags, and their relationships represented in a JSON format.
+  * `expression_containers` - (List) Contains one or more tag types (and associated tags) combined using logical operators within a workload group
+    * `tag_type` - (String) The tag type selected from a predefined list. Returned values are: ``ANY``, ``VPC``, ``SUBNET``, ``VM``, ``ENI``, ``ATTR``
+    * `operator` - (String) The operator (either AND or OR) used to create logical relationships among tag types. Returned values are: ``AND``, ``OR``, ``OPEN_PARENTHESES``, ``CLOSE_PARENTHESES``
+    * `tag_container` - (String) Contains one or more tags and the logical operator used to combine the tags within a tag type ``CLOSE_PARENTHESES``
+      * `tags` - (String) One or more tags, each consisting of a key-value pair, selected within a tag type. If multiple tags are present within a tag type, they are combined using a logical operator. Note: A maximum of 8 tags can be added to a workload group, irrespective of the number of tag types present.
+        * `key` - (String) The key component present in the key-value pair contained in a tag
+        * `value` - (string) The value component present in the key-value pair contained in a tag
+    * `operator` - (String) The operator (either AND or OR) used to create logical relationships among tag types. Returned values are: ``AND``, ``OR``, ``OPEN_PARENTHESES``, ``CLOSE_PARENTHESES``
+* `expression` - (String) The workload group expression containing tag types, tags, and their relationships.
+* `last_modified_time` - (Number) When the rule was last modified
+* `last_modified_by`
+  * `id` - (Number) Identifier that uniquely identifies an entity
+  * `name` -(String) The configured name of the entity
+  * `extensions` - (Map of String)

examples/zia_workload_groups/datasource.tf

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+data "zia_workload_groups" "this" {
+    name = "Example"
+}
+