Cloud Identity Group module (#182)

* New Cloud Identity module

* Add tests to cloud-identity-group module

* Fix boilerplate

* Fix outputs

* Remove support for creating managers and admins

* Update cloud-identity-group README

* Small fix to cloud-identity-group README

modules/cloud-identity-group/variables.tf

@@ -0,0 +1,58 @@
+/**
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+variable "display_name" {
+  description = "Group display name."
+  type        = string
+}
+
+variable "name" {
+  description = "Group ID (usually an email)."
+  type        = string
+}
+
+variable "description" {
+  description = "Group description"
+  type        = string
+  default     = null
+}
+
+variable "customer_id" {
+  description = "Directory customer ID in the form customers/C0xxxxxxx."
+  type        = string
+  validation {
+    condition     = can(regex("^customers/C0[a-z0-9]{7}$", var.customer_id))
+    error_message = "Customer ID must be in the form customers/C0xxxxxxx."
+  }
+}
+
+# variable "owners" {
+#   description = "List of group owners."
+#   type        = list(string)
+#   default     = []
+# }
+
+# variable "managers" {
+#   description = "List of group managers."
+#   type        = list(string)
+#   default     = []
+# }
+
+variable "members" {
+  description = "List of group members."
+  type        = list(string)
+  default     = []
+}