add editorconfig

.editorconfig

+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 120
+tab_width = 4
+trim_trailing_whitespace = true
+
+[{*.jadd,*.java,*.jrag}]
+indent_size = 2
+tab_width = 2
+ij_continuation_indent_size = 4