adding initial docs

docs/documentation/installation.md

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+# Installation
+
+The task is written in Python 3.7.9 using Apache Beam 2.32.0. Python versions 3.6.14 and 3.8.11 should also be compatible but have not been tested.
+
+The task has been tested on MacOS Big Sur and WSL2. The task should run on Windows but this wasn't tested.
+
+For Beam 2.32.0 the supported versions of the Python SDK can be found [here](https://cloud.google.com/dataflow/docs/concepts/sdk-worker-dependencies#sdk-for-python).
+
+## Poetry
+
+The test uses [Poetry](https://python-poetry.org) for dependency management.
+
+!!! info inline end
+    If you already have Poetry installed globally you can go straight to the `poetry install` step.
+
+In a virtual environment install poetry:
+
+```bash
+pip install poetry
+```
+
+From the root of the repo install the dependencies with:
+
+```bash
+poetry install --no-dev
+```