Add .editorconfig file

Author: YoranBrondsema

.editorconfig

@@ -0,0 +1,13 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+# Indentation override for all JS under lib directory
+[*.js]
+indent_style = tab