build: add editorconfig

Author: favna

.editorconfig

@@ -0,0 +1,22 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{js,ts}]
+indent_size = 4
+indent_style = tab
+block_comment_start = /*
+block_comment = *
+block_comment_end = */
+
+[*.{yml,yaml}]
+indent_size = 2
+indent_style = space
+
+[*.{md,rmd,mkd,mkdn,mdwn,mdown,markdown,litcoffee}]
+tab_width = 4
+trim_trailing_whitespace = false