added presenter module and truezen

after/plugin/truezen.lua

@@ -0,0 +1,14 @@
+local status_ok, truezen = pcall(require, "true-zen")
+if not status_ok then
+	return
+end
+
+truezen.setup {
+  modes = {
+    ataraxis = {
+      minimum_writing_area = {
+        width = 85,
+      },
+    }
+  }
+}