added documentation

website/source/docs/providers/aws/r/elasticache_parameter_group.html.markdown

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+---
+layout: "aws"
+page_title: "AWS: aws_elasticache_parameter_group"
+sidebar_current: "docs-aws-resource-elasticache-parameter-group"
+---
+
+# aws\_elasticache\_parameter\_group
+
+Provides an ElastiCache parameter group resource.
+
+## Example Usage
+
+```
+resource "aws_elasticache_parameter_group" "default" {
+    name = "cache-params"
+    family = "redis2.8"
+    description = "Cache cluster default param group"
+
+  	parameter {
+   	  name = "activerehashing"
+   	  value = "yes"
+   	}
+
+   	parameter {
+      name = "min-slaves-to-write"
+      value = "2"
+    }
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `name` - (Required) The name of the ElastiCache parameter group.
+* `family` - (Required) The family of the ElastiCache parameter group.
+* `description` - (Required) The description of the ElastiCache parameter group.
+* `parameter` - (Optional) A list of ElastiCache parameters to apply.
+
+Parameter blocks support the following:
+
+* `name` - (Required) The name of the ElastiCache parameter.
+* `value` - (Required) The value of the ElastiCache parameter.
+
+## Attributes Reference
+
+The following attributes are exported:
+
+* `id` - The ElastiCache parameter group name.