Set up project configuration: EditorConfig, Git attributes, devcontainer, Release Drafter, SECURITY.md, and README badges

.editorconfig

@@ -0,0 +1,20 @@
+# EditorConfig: consistent style across editors
+# https://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{java,kts}]
+indent_style = space
+indent_size = 4
+
+[*.{yml,yaml,md,json}]
+indent_size = 2
+
+[*.bat]
+end_of_line = crlf