docs: Add sysdig_user documentation

Signed-off-by: Federico Barcelona <fede_rico_94@hotmail.com>

website/docs/r/sysdig_user.html.markdown

@@ -0,0 +1,35 @@
+---
+layout: "sysdig"
+page_title: "Sysdig: sysdig_user"
+sidebar_current: "docs-sysdig-user"
+description: |-
+  Creates a user in Sysdig.
+---
+
+# sysdig\_user
+
+Creates a user in Sysdig.
+
+~> **Note:** This resource is still experimental, and is subject of being changed.
+
+## Example usage
+
+```hcl
+resource "sysdig_user" "foo-bar" {
+  email = "foo.bar@sysdig.com"
+  system_role = "ROLE_CUSTOMER"
+  first_name = "foo"
+  last_name = "bar"
+}
+```
+
+## Argument Reference
+
+* `email` - (Required) The email for the user to invite.
+
+* `system_role` - (Optional) The privileges for the user. It can be either "ROLE_USER" or "ROLE_CUSTOMER".
+    If set to "ROLE_CUSTOMER", the user will be known as an admin.
+
+* `first_name` - (Optional) The name of the user.
+
+* `last_name` - (Optional) The last name of the user.