Update README.md

Author: jeevakir

README.md

@@ -11,18 +11,22 @@ Prerequisites
     pip3 install imdlib
 3.GUI library PySimpleGUI for easy user interface
     pip3 install pysimplegui
-    
+ 
+ **you can download all libraries with single command :- "pip3 install -r requirements.txt"**
+ 
  **(Don't change any of the file or folder names)**
 
 WORKING
 
   1.extract the git
-  
+    
   2.enter required latitudes and longitudes in lat-long.csv file **(Don't change any of the file or folder names)**
 
-  3.execute imd-down.py or if you want GUI use IMD-GUI.pyw
+  3.install needed libraries using command: "pip3 install -r requirements.txt"
+  
+  4.execute imd-down.py or if you want GUI use IMD-GUI.pyw
 
-  4.enter start year and end year when prompted
+  5.enter start year and end year when prompted
 
-  5.output files will be generated in the root folder
+  6.output files will be generated in the root folder