Improve README quality

[Russell-Newton]

As a user of MultiTouch, I would like to be able to learn everything I need to know from the README.

Update the README to improve its visual quality and content.

[Russell-Newton]

@all-contributors please add @Russell-Newton for code, docs, infra, maintenance please add @xorbit3024 for code, docs, infra, tests please add @jrdike for code, docs, tests please add @ocean-ift for code, docs, tests please add @deborahsrcho for code, design, content

[allcontributors[bot]]

@Russell-Newton

@Russell-Newton already contributed before to code, doc, infra, maintenance

@xorbit3024 already contributed before to code, doc, infra, test

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[Russell-Newton]

@all-contributors please add @Russell-Newton for code, docs, infra, maintenance

[allcontributors[bot]]

@Russell-Newton

I've put up a pull request to add @Russell-Newton! :tada:

[Russell-Newton]

@all-contributors please add @xorbit3024 for code, docs, infra, tests

[allcontributors[bot]]

@Russell-Newton

I've put up a pull request to add @xorbit3024! :tada:

[Russell-Newton]

@all-contributors please add @jrdike for code, docs, tests

[allcontributors[bot]]

@Russell-Newton

I've put up a pull request to add @jrdike! :tada:

[Russell-Newton]

@all-contributors please add @ocean-ift for code, docs, tests

[allcontributors[bot]]

@Russell-Newton

I've put up a pull request to add @ocean-ift! :tada:

[Russell-Newton]

@all-contributors please add @deborahsrcho for code, design, content

[allcontributors[bot]]

@Russell-Newton

I've put up a pull request to add @deborahsrcho! :tada: