add editor config

Author: LayZeeDK

.editorconfig

@@ -0,0 +1,21 @@
+# Editor configuration, see http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+max_line_length = 80
+trim_trailing_whitespace = true
+
+[*.md]
+max_line_length = 120
+trim_trailing_whitespace = false
+
+[*.json]
+insert_final_newline = false
+max_line_length = off
+
+[*.ts]
+quote_type = single