core/src/main/java/org/markdownj/TextEditor.java
public TextEditor indent(int spaces) {
        StringBuilder sb = new StringBuilder(spaces);
        for (int i = 0; i < spaces; i++) {
            sb.append(' ');
        }
        return replaceAll("^", sb.toString());
    }
public TextEditor indent(int spaces) {
        StringBuilder sb = new StringBuilder(spaces);
        for (int i = 0; i < spaces; i++) {
            sb.append(' ');
        }
        return replaceAll("^", sb.toString());
    }
Introduce a number of spaces at the start of each line.
@param spaces
@return