React app chapter

[sverhoeven]

A C++ developer I would like to know how to wrap the root finding algorithm in a simple React application. The chapter should introduce things slowly so instead of using the create react app template or Typescript use a skeleton like https://reactjs.org/docs/add-react-to-a-website.html#quickly-try-jsx

Acceptance criteria:

• Someone (aka reviewer) is able to understand and run example

Tasks:

• Form to set input values
• After submit start web worker
• Run root finding algorithm in web worker with emscripten files
• Show progress to user, using messages
• Show result as a number

[sverhoeven]

At the end of the chapter it would be nice to render the form using a JSON schema and react-jsonschema-form from a CDN.