AIRFLOW-960 Add .editorconfig file

.editorconfig

@@ -0,0 +1,32 @@
+root = true
+
+[*]
+end_of_line = lf
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+
+[*.py]
+indent_size = 4
+
+[*.sh]
+indent_size = 4
+
+[*.sql]
+indent_size = 4
+
+[*.js]
+indent_size = 2
+
+[*.css]
+indent_size = 2
+
+[*.{md,rst}]
+indent_size = 2
+
+[*.{yml,yaml}]
+indent_size = 2
+
+[*.{htm,html}]
+indent_size = 2