build: add editor config

Author: yeikos

.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+[{*.ts,*.md,*.html,*.json,webpack.config.js}]
+end_of_line = lf
+charset = utf-8
+indent_style = tab
+indent_size = 4
+
+[package-lock.json]
+indent_style = space
+indent_size = 2