Add changelog and contribution guide.
|# Contributing to Better|
|**Thank you for your interest in contributing to Better.**|
|Better is licensed under AGPLv3. However, we also ask that you to sign a contributor license agreement (CLA) before we can accept your contributions.|
|For details, [please see the contribution guide in the main Better repository.](https://source.ind.ie/better/better/blob/master/CONTRIBUTING.md)|
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