Update README.md

Author: myon-bioinformatics

README.md

@@ -1,2 +1,7 @@
 # python3nmap_GUI_for_Beginners
-Use nmap library in GUI and Python(You must install "PySimpleGUI" and "python3-nmap" via pip)
+Use nmap library in GUI and Python(You must install "PySimpleGUI" and "python3-nmap" via pip)  
+[info]When you use python-nmap3, you must install nmap at any OS.  
+[info] Some functions(udp_scan, os_detection,subnet_scan) 
+#PySimpleGUI Reference: https://github.com/PySimpleGUI/PySimpleGUI  
+#python3-nmap Reference: https://pypi.org/project/python3-nmap/  
+#Nmap Reference: https://nmap.org/download.html