Create README.md

Author: jayascript

simpy/README.md

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+# Simulating Real-World Processes With SimPy
+
+Corresponding code for ["Simulating Real-World Processes With SimPy."](https://realpython.com/simulation-with-simpy/)
+
+## Running the Script
+
+The file `simulate.py` contains the script that mimics the tutorial code. You can execute the code by running `python3 simulate.py` from the directory that contains the file.
+
+Here is some sample output:
+
+```console
+$ python3 simulate.py
+Input # of cashiers working: 1
+Input # of servers working: 1
+Input # of ushers working: 1
+The average wait time is 38 minutes and 7 seconds.
+```