[ara] Add an editorconfig file

.editorconfig

@@ -0,0 +1,13 @@
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+max_line_length = 100
+# 2 space indentation
+[*.{sv, svh, v, vhd}]
+indent_style = space
+indent_size = 2