Create pleroma.email mix task

Closes: https://git.pleroma.social/pleroma/pleroma/issues/1061

lib/mix/tasks/pleroma/email.ex

@@ -0,0 +1,25 @@
+defmodule Mix.Tasks.Pleroma.Email do
+  use Mix.Task
+
+  @shortdoc "Simple Email test"
+  @moduledoc File.read!("docs/administration/CLI_tasks/email.md")
+
+  def run(["test" | args]) do
+    Mix.Pleroma.start_pleroma()
+
+    {options, [], []} =
+      OptionParser.parse(
+        args,
+        strict: [
+          to: :string
+        ]
+      )
+
+    email = Pleroma.Emails.AdminEmail.test_email(options[:to])
+    {:ok, _} = Pleroma.Emails.Mailer.deliver(email)
+
+    Mix.shell().info(
+      "Test email has been sent to #{inspect(email.to)} from #{inspect(email.from)}"
+    )
+  end
+end