Add consumer data source docs

docs/data-sources/consumer.md

@@ -0,0 +1,24 @@
+---
+subcategory: "Runtime Configuration"
+---
+# Data Source: konnect_consumer
+Represents a consumer
+## Example usage
+```hcl
+data "konnect_runtime_group" "RuntimeGroup" {
+  name = "TestRuntimeGroup"
+}
+data "konnect_consumer" "example" {
+  runtime_group_id = data.konnect_runtime_group.RuntimeGroup.id
+  search_username = "Bob"
+}
+```
+## Argument Reference
+* `runtime_group_id` - **(Required, String)** The id of the runtime group containing consumer
+* `search_username` - **(Optional, String)** The search string to apply to the username of the consumer. Uses contains.
+* `username` - **(Optional, String)** The filter string to apply to the username of the consumer. Uses equality.
+* `search_custom_id` - **(Optional, String)** The search string to apply to the custom_id of the consumer. Uses contains.
+* `custom_id` - **(Optional, String)** The filter string to apply to the custom_id of the consumer. Uses equality.
+## Attribute Reference
+* `id` - **(String)** Same as `runtime_group_id`:`consumer_id`
+* `consumer_id` - **(String)** Id of the consumer alone