Add EditorConfig

.editorconfig

@@ -0,0 +1,17 @@
+# Top-most EditorConfig file ?
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+# Indentiation
+[*.py]
+indent_style = space
+indent_size = 4
+
+[*.{css,js,json,html}]
+indent_style = space
+indent_size = 2