Add prettier formatting

[ElectricMountains]

This PR adds prettier formatting as default for the project. It does this in the following ways:

• Install prettier with its config files
• Install Husky to run it every time you commit code
• Add a github action that checks if all files are formatted

For more details: https://prettier.io/docs/install

Fixes #47
Part of #159

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[ElectricMountains]

@drifter089 @BryanFran
I've added a check for prettier formatting, that is failing at the moment due to a bunch of files needing formatting.
Shall we use the meeting later today to format then merge this PR?
During the meeting we just have to run the command "npx prettier . --write", which will format everything.

From then onwards a github check runs "npx prettier --check ." which means PRs will only pass when the files are all correctly formatted. Feel free to share your thoughts.

[drifter089]

@ElectricMountains ,
this is great , can we have a way so pre-commit bot or a action adds these commits and our commit history remains intact.

[drifter089]

super we can do auto bot later