add .editorconfig

.editorconfig

@@ -0,0 +1,24 @@
+# http://editorconfig.org/
+
+root = true
+
+[*]
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+end_of_line = lf
+
+[*.go]
+indent_style = tab
+indent_size = 4
+
+[{*.yml,*.yaml}]
+indent_style = space
+indent_size = 2
+
+[*.sh]
+indent_style = space
+indent_size = 4
+
+[Makefile]
+indent_style = tab