website: add digitalocean ssh_key documentation

cc/ @plalloni

r/ssh_key.html.markdown

@@ -0,0 +1,41 @@
+---
+layout: "digitalocean"
+page_title: "DigitalOcean: digitalocean_ssh_key"
+sidebar_current: "docs-do-resource-ssh-key"
+description: |-
+  Provides a DigitalOcean SSH key resource.
+---
+
+# digitalocean\_ssh_key
+
+Provides a DigitalOcean SSH key resource to allow you manage SSH
+keys for Droplet access. Keys created with this resource
+can be referenced in your droplet configuration via their ID or
+fingerprint.
+
+## Example Usage
+
+```
+# Create a new SSH key
+resource "digitalocean_ssh_key" "default" {
+    name = "Terraform Example"
+    public_key = "${file("/Users/terraform/.ssh/id_rsa.pub")}"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `name` - (Required) The name of the SSH key for identification
+* `public_key` - (Required) The public key. If this is a file, it
+can be read using the file interpolation function
+
+## Attributes Reference
+
+The following attributes are exported:
+
+* `id` - The unique ID of the key
+* `name` - The name of the SSH key
+* `public_key` - The text of the public key
+* `fingerprint` - The fingerprint of the SSH key