Add editor config

Author: matthieubosquet

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+
+[*.css]
+indent_style = space
+indent_size = 2
+
+[*.html]
+indent_style = space
+indent_size = 2