Add readme

README.md

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+# Example development flow
+
+This is an example of a build where a simple python application is being developed for multiple versions of python at the same time.
+
+## Usage
+
+```bash
+git clone <repo>
+cd <repo>
+docker-compose up -d
+```
+
+Open a browser for the following 3 url's:
+
+* <http://localhost:8037>
+* <http://localhost:8038>
+* <http://localhost:8039>