add .editorconfig

Author: oemdaro

.editorconfig

@@ -0,0 +1,23 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_size = 2
+indent_style = space
+
+[*.{md, markdown}]
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_size = 4
+indent_style = tab
+
+[*.go]
+indent_size = 4
+indent_style = tab