<commit_before># Spectrogram
1) Clone the repo
2) Run :$ sudo npm install
3) Run :$ gulp build-all
4) Run :$ gulp

**This is not an official Google product**<commit_msg>updated spectrogram readme<commit_after># Spectrogram
- Clone the repo
- Run :$ sudo npm install
- Run :$ gulp build-all
- Run :$ gulp

**This is not an official Google product**
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