Added locust test file and README

simulation-tests/README.md

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+# locust
+
+A simple open source load testing tool that allows to define user behavior.
+
+In order to set it up for the first time, we followed the documentation at https://locust.io/. In particular, we:
+
+* Defined a class for the users that will be simulating.
+* Defined a ``wait_time`` variable that will make the simulated users wait between the specified seconds after each task executed.
+* Decorated our method with ``@Task`` that creates a micro-thread that calls this method.
+* Defined the ``self.client`` attribute that makes it possible to make HTTP calls that will be logged by Locust.
+
+To use, open the terminal on this folder and run the following command:
+
+``locust -f locust.py --host https://cara.web.cern.ch``
+
+Then, open up a browser and point it to http://localhost:8089. 
+By default we pointed out the test to our own web server.
+``Start swarming`` will trigger the simulation.

simulation-tests/locust.py

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+import time
+from locust import HttpUser, task, between
+
+class WebsiteUser(HttpUser):
+    '''Time (in seconds) between the execution of each task.'''
+    wait_time = between(10, 20)
+
+    @task
+    def baseline_model(self):
+        self.client.get(url="/calculator-open/baseline-model/result")