chore: add .editorconfig (#26)

.editorconfig

@@ -0,0 +1,19 @@
+# Editor configuration, see https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.gradle]
+indent_size = 4
+
+[{*.json,*.jschema}]
+indent_size = 4
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false