chore: Add project level EditorConfig options

Author: alerque

.editorconfig

@@ -0,0 +1,20 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+trim_trailing_whitespace = true
+
+[*.ledger]
+indent_style = space
+indent_size = 4
+max_line_length = 120
+
+[*.vim]
+indent_style = space
+indent_size = 2
+max_line_length = 120
+
+[*.md]
+trim_trailing_whitespace = false