Add basic configuration management module.

lib/pleroma/config.ex

@@ -0,0 +1,15 @@
+defmodule Pleroma.Config do
+  use Agent
+
+  def start_link(initial) do
+    Agent.start_link(fn -> initial end, name: __MODULE__)
+  end
+
+  def get(path) do
+    Agent.get(__MODULE__, Kernel, :get_in, [path])
+  end
+
+  def put(path, value) do
+    Agent.update(__MODULE__, Kernel, :put_in, [path, value])
+  end
+end