Add readme files and screenshots to sample projects #191
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Per Bastiaan's suggestion, adds readme files with screenshots to the sample projects. Since there will be doc pages for all these features, I don't go into any detail in the readmes and just link to the relevant docs (with the exception of the body tracking sample, which doesn't have relevant docs written yet).
Making this a draft for the time being because some of the doc links won't work until the corresponding doc PR is merged.
Closes #179