\documentclass[a4paper,12pt]{report}
\usepackage{graphicx} % inserting images
%\usepackage{hyperref} % PDF links
\usepackage{setspace} % for switching between double/single space in document
\usepackage{fancyhdr} % package for changing Headings style
\usepackage{indentfirst} 



%---------------------------------------------------------------------------------------------------------------------
% setting the margins of page
\usepackage[top=2.5cm,right=3.5cm,bottom=2.5cm,left=2.5cm]{geometry}                 
\usepackage{xepersian}

%--------------------------------------------------------------------
% tell tex engine address of folder containing your pictures
\graphicspath{{images/}}
%---------------------------------------------------------------------
% commands to print the page number in header or foot
\pagestyle{fancy}
\fancyhf{} 
\fancyfoot[l]{\thepage} 
\renewcommand{\headrulewidth}{0pt} 
%\lhead{}

%---------------------------------------------------------------------
% commands related to XePersian package
\settextfont[Scale=1.1]{XB Yas}
\setdigitfont{XB Yas}

%\setlatintextfont{LinLibertine}

\begin{document}

\pagenumbering{harfi}
\tableofcontents
\listoffigures
\listoftables
%--------------------------------------------------------------------------------------------------------
% insert each of your chapters with a \inlcude{filename} command as below
\doublespacing

\include{chap1}


\end{document}