add how to use

README.md

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 Browser Recorder records user session workflow while recording the network activity. The recorded data then is used to playback alongside the network requests.
 The goal is to capture a list of related network requests. This project is highly inspired by webviz project, https://webviz.io/app/?demo=&seek-to=1490150288.327839653.
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+## How to use?
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+`npm run record` will produce 2 files: report_<timestamp>.mp4 and report_<timestamp>.json.
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+`npm run visualize` will serve a web app that takes these 2 files and align the recorded video and network requests/responses in the json.