Add site import to docs (#90)

* Add site import to docs
* Add user_group import to docs

docs/resources/site.md

@@ -28,4 +28,11 @@ resource "unifi_site" "mysite" {
 - **id** (String) The ID of the site.
 - **name** (String) The name of the site.
 
+## Import
 
+Import is supported using the following syntax:
+
+```shell
+# import using the ID
+terraform import unifi_site.mysite 5fe6261995fe130013456a36
+```

docs/resources/user_group.md

@@ -36,4 +36,11 @@ resource "unifi_user_group" "wifi" {
 
 - **id** (String) The ID of the user group.
 
+## Import
 
+Import is supported using the following syntax:
+
+```shell
+# import using the ID
+terraform import unifi_user_group.wifi 5fe6261995fe130013456a36
+```

examples/resources/unifi_site/import.sh

@@ -0,0 +1,2 @@
+# import using the ID
+terraform import unifi_site.mysite 5fe6261995fe130013456a36

examples/resources/unifi_user_group/import.sh

@@ -0,0 +1,2 @@
+# import using the ID
+terraform import unifi_user_group.wifi 5fe6261995fe130013456a36