chore(docs): add editorconfig file

For now, it only applies to web-related files

Signed-off-by: Lucien Cartier-Tilet <lucien@phundrak.com>

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+trim_trailing_whitespace = true
+
+[*.{json,ts,css}]
+indent_style = space
+indent_size = 2
+
+[*.ts]
+quote_type = single