Add editorconfig file

Author: lukastaegert

.editorconfig

@@ -0,0 +1,13 @@
+# editorconfig.org
+root = true
+
+[*.ts]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false