add README

Author: Rui Li

README.md

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+# mobility
+Simulation scripts for the mobility management of UAV base stations project mainly built for paper https://dl.acm.org/citation.cfm?id=3308964. 
+
+# Requirements  
+* python2.7  
+* numpy
+* tensorflow  
+* IPython  
+* matplotlib   
+
+# Files
+* main.py   
+* channel.py  
+* mobile_env.py  
+
+* main_test.py  
+
+# Build virtual environment  
+` virtualenv env  `  
+` source env/bin/activate ` 
+
+# Run training  
+` mkdir train `   
+` python main.py  `  
+
+