Add editorconfig.

.editorconfig

@@ -0,0 +1,21 @@
+#
+# Lithium: the most rad php framework
+#
+# @copyright     Copyright 2016, Union of RAD (http://union-of-rad.org)
+# @license       https://opensource.org/licenses/BSD-3-Clause The BSD 3-Clause License
+#
+
+# See http://editorconfig.org on how to put this file to good use.
+# See http://li3.me/docs/book/specs/1.x/accepted/LSR-0-coding
+
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+
+[*.php]
+indent_style = tab
+tab_width = 4
+insert_final_newline = false
+trim_trailing_whitespace = true