add readme and vscode screenshot

Author: cyberw

README.md

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+# Locust Tutorial Repo
+
+This repo contains an example of a locustfile and VSCode settings to run it.
+
+Open it, install the recommended plugins and install Locust using the Locust VSCode Extension's Initialize command (or manually).
+
+You can also use VSCode's Testing feature to run or even debug pytest-style locustfiles, just click the green arrow.
+
+![Pytest style Locustfile](vscode.png)