feat(redis): create instructions to extract redis data to a text file

src/data-migration/redis/.gitignore

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+pyenv/
+dump.rdb
+dump.txt

src/data-migration/redis/README.md

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+# Redis migration
+
+## Get the data
+
+1. Use the `redis-cli save` command to export a `dump.rdb`.
+1. Place it in this folder
+
+## Setup python
+
+1. Use venv to create a virtual env.
+   - `python -m venv pyenv`
+1. Install the packages
+   - source ./pyenv/bin/activate
+   - pip install -r requirements.txt
+
+## Extract from the RDB
+
+1. Covert the redis dump to key value pairs
+   - rdb --command justkeyvals ./dump.rdb | sort > dump.txt
+
+## Filter the data
+
+## Load the data

src/data-migration/redis/requirements.txt

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+rdbtools
+python-lzf
+setuptools