docs: add target resource docs

website/docs/r/resource_target.html.markdown

@@ -0,0 +1,69 @@
+---
+layout: "boundary"
+page_title: "Boundary: target_resource"
+sidebar_current: "docs-boundary-target-resource"
+description: |-
+  Target resource for the Boundary Terraform provider.
+---
+
+# boundary_target_resource 
+The target resource allows you to configure a Boundary target. 
+
+## Example Usage
+
+```hcl
+resource "boundary_organization" "foo" {}
+
+resource "boundary_project" "foo" {
+  name     = "foo_project"
+  scope_id = boundary_organization.foo.id
+}
+
+resource "boundary_host_catalog" "foo" {
+  name        = "test"
+	description = "test catalog"
+  scope_id    = boundary_project.foo.id
+	type        = "static"
+}
+
+resource "boundary_host" "foo" {
+  name            = "foo"
+	host_catalog_id = boundary_host_catalog.foo.id
+	scope_id        = boundary_project.foo.id
+	address         = "10.0.0.1:80"
+}
+
+resource "boundary_host" "bar" {
+  name            = "bar"
+	host_catalog_id = boundary_host_catalog.foo.id
+	scope_id        = boundary_project.foo.id
+	address         = "10.0.0.1:80"
+}
+
+resource "boundary_host_set" "foo" {
+  name            = "foo"
+  host_catalog_id = boundary_host_catalog.foo.id
+
+  host_ids = [
+    boundary_host.foo.id,
+		boundary_host.bar.id,
+	]
+}
+
+resource "boundary_target" "foo" {
+  name         = "foo"
+	description  = "Foo target"
+	scope_id     = boundary_project.foo.id
+	host_set_ids = [
+    boundary_host_set.foo.id
+	]
+}
+```
+
+## Argument Reference
+
+The following arguments are optional:
+* `description` - The target description.
+* `name` - The target name. Defaults to the resource name.
+* `scope_id` - The scope ID in which the resource is created. Defaults to the provider's `default_scope` if unset.
+* `host_set_ids` - A list of host set ID's.