Update playground's `README`

[mdubus]

Currently, the playground's README looks like this: https://github.com/meilisearch/meilisearch-rails/blob/main/playground/README.md

We do have a section in the CONTRIBUTING to help us install it, but it is not sufficient enough to understand how it works and how to make it run.

We should consider adding more explanations inside the README of the playground and add a link to it in the CONTRIBUTING in order to help new contributors understand how they can easily test their changes 🙃

[curquiza]

Hello @mdubus

it is not sufficient enough to understand how it works and how to make it run.

What do you mean exactly? What is it missing for you, can you detail? So that we can improve the README accordingly to your expectations

[mdubus]

It may be my lack of knowledge of the rails environment, but here are the 2 main "problems" I encountered:

• By running bundle exec rails webpacker:install it asked me Overwrite meilisearch-rails/playground/babel.config.js? and I didn't know what to do
• The CONTRIBUTING.md says:

bundle install
bundle exec rails db:create
bundle exec rails db:migrate
bundle exec rails db:seed
bundle exec rails webpacker:install
bundle exec rails server

But I don't know what this commands are for. I would have liked small comments to explain it briefly.

Other small "problems" I want to highlight:

• The CONTRIBUTING.md doesn't tell us that something will run on http://127.0.0.1:3000/ nor what the aim of this playground is. it is clear once running it, but by reading the CONTRIBUTING.md I didn't know what to expect from it.
• I first went to the playground's README to know how to start it, by instinct, but the content I was searching for was in the CONTRIBUTING.md, which confused me. If there is a README in the playground, I expect to find the explanations about how to start the playground directly in it.