chore: add .editorconfig for consistent code style

Introduce a top-level .editorconfig file to enforce consistent indentation,
line endings, charset, and whitespace handling across editors. Special
rules are included for Markdown files and Makefiles to accommodate their
formatting requirements.

Author: dansomething

.editorconfig

@@ -0,0 +1,22 @@
+; EditorConfig is awesome: http://EditorConfig.org
+
+; top-most EditorConfig file
+root = true
+
+; base rules
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+; Dont remove trailing whitespace from markdown
+; files since it messes up newlines
+[*.md]
+trim_trailing_whitespace = false
+
+; Make does not work without tabs
+[Makefile]
+indent_style = tab