Improve developer contribution process #2951

• [ x ] I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

Creating a PR for this project is painful. Building the app is not straight forward.

Building this on Ubuntu doesn't work. Would be good to know what environment you run the npm commands in.

yarn isn't a dependency so when eventually I tried powershell I had to globally install that too.

Also, the tests fail for me in web-worker related code. I was running on node v15.11.0 but again... no minimum version is specified so I don't know if this is ok or not?!?

What does the proposed API look like?

Clearer instructions working tests please!

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