adding docs page

Author: lukegriffith

website/docs/r/project_mirror.html.markdown

@@ -0,0 +1,43 @@
+---
+layout: "gitlab"
+page_title: "GitLab: gitlab_project_mirror"
+sidebar_current: "docs-gitlab-resource-project_mirror"
+description: |-
+  Adds a target to a projects remote mirrors.
+---
+
+# gitlab\_project_mirror
+
+This resource allows you to add a mirror target for the repository, all changes will be synced to the remote target.
+
+## Example Usage
+
+```hcl
+resource "gitlab_project_mirror" "foo" {
+  project = "1"
+  url = "https://username:password@github.com/org/repository.git"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `project` - (Required) The id of the project.
+
+* `url` - (Required) 	The URL of the remote repository to be mirrored.
+
+* `enabled` - 	Determines if the mirror is enabled.
+
+* `only_protected_branches` - Determines if only protected branches are mirrored.
+
+* `keep_divergent_refs` - Determines if divergent refs are skipped.
+
+## Import
+
+GitLab project mirror can be imported using an id made up of `project_id:mirror_id`, e.g.
+
+
+```
+$ terraform import gitlab_project_mirror.foo "12345:1337"
+```