Introduce editorconfig for more consistent formatting

.editorconfig

@@ -0,0 +1,16 @@
+; editorconfig.org
+root = true
+
+[*]
+charset                     = utf-8
+continuation_indent_size    = 2
+end_of_line                 = lf
+indent_size                 = 2
+indent_style                = space
+insert_final_newline        = true
+max_line_length             = 120
+tab_width                   = 2
+; trim_trailing_whitespace    = true ; disabled until files are cleaned up
+
+[*.md]
+trim_trailing_whitespace    = false