website: add digitalocean ssh_key documentation

cc/ @plalloni

website/source/docs/providers/do/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

website/source/layouts/digitalocean.erb

@@ -23,6 +23,10 @@
 
                     <li<%= sidebar_current("docs-do-resource-record") %>>
 					<a href="/docs/providers/do/r/record.html">digitalocean_record</a>
+                    </li>
+
+                    <li<%= sidebar_current("docs-do-resource-ssh-key") %>>
+                    <a href="/docs/providers/do/r/ssh_key.html">digitalocean_ssh_key</a>
                     </li>
 				</ul>
 				</li>