Adding requirments.txt and remove installation from Readme.md

Author: abdallah1097

Python/Desktop_Time_Tracker/Readme.md

@@ -9,10 +9,7 @@ This script is written in python and can be used to track user time used on Desk
 ### Installation
 ```bash
 $ sudo apt-get install xdotool
-$ pip install subprocess
-$ pip install time
-$ pip install matplotlib
-$ pip install yaml
+$ pip install -r requirements.txt
 ``` 
 
 ### Usage

Python/Desktop_Time_Tracker/requirements.txt

@@ -0,0 +1,2 @@
+matplotlib==3.3.2
+pyyaml==5.3.1