Merge #1360

1360: Rename README.md to README.markdown r=dichotommy a=dichotommy

# Pull Request

## What does this PR do?
Fixes #1030 
According to information obtained [here](vuejs/vuepress#2106 (comment))
This solution is also mentioned in [this thread](vuejs/vuepress#23 (comment))

## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to MeiliSearch!


Co-authored-by: Tommy Melvin <[email protected]>

Author: bors[bot]