chore: import upstream snapshot with attribution

.editorconfig

@@ -0,0 +1,55 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+# The line max length is 120, match checkstyle rules.
+max_line_length = 120
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.json]
+tab_width = 2
+indent_size = 2
+
+[*.{yml,yaml}]
+tab_width = 2
+indent_size = 2
+
+[*.xml]
+ij_xml_attribute_wrap = off
+ij_xml_text_wrap = off
+ij_xml_keep_blank_lines = 1
+
+[pom.xml]
+indent_size = 2
+
+[*.java]
+indent_size = 4
+tab_width = 4
+
+[*.js]
+indent_size = 2
+
+[*.ts]
+indent_size = 2