Add README

README.md

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+# fetch-matrix-access-token
+## Why
+The access token from Element can not be used for a different app (it seems).
+With this simple script you can retrieve the access token and then use it for a different app since this script won't create any encryption.
+
+## Requirements
+* The matrix server, where the account is located, needs password-login enabled
+* local environment requires nodejs, yarn and nvm
+
+## Installation & setup
+* `yarn install`
+* `nvm use`
+* run `cp config.js.example config.js`
+* edit the `config.js`
+
+## Fetching the key
+* `yarn start`
+The script will print the access token.
+
+## Credits
+This script is based on snippets from the documentation of [matrix-bot-sdk](https://github.com/turt2live/matrix-bot-sdk)