add .editorconfig

.editorconfig

@@ -0,0 +1,30 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{css,js,py}]
+charset = utf-8
+indent_style = space
+indent_size = 4
+
+[Makefile]
+indent_style = tab
+
+[{.travis.yml,codecov.yml}]
+indent_style = space
+indent_size = 2
+
+# Ignore paths
+[/modoboa/bower_components/**]
+charset = none
+end_of_line = none
+insert_final_newline = none
+trim_trailing_whitespace = none
+indent_style = none
+indent_size = none