docs : minor edit in README file installation

Author: sepandhaghighi

README.md

@@ -41,8 +41,8 @@ By [Moduland Co](http://www.moduland.ir)
 ## Installation
 ### Source Code
 - Download [Version 0.23](https://github.com/moduland/Orangetool/archive/v0.23.zip) or [Latest Source ](https://github.com/Moduland/Orangetool/archive/master.zip)
-
-- `python3 setup.py install`
+- `pip3 install -r requirements.txt` or `pip install -r requirements.txt` (Need root access)	
+- `python3 setup.py install` or `python setup.py install`
 ### PyPI
 
 - Check [Python Packaging User Guide](https://packaging.python.org/installing/)