Update README

README.md

@@ -25,11 +25,52 @@ choco install ffmpeg
 scoop install ffmpeg
 ```
 
+## How to use
+
+To record from a system microphone, select a model, language, microphone, and task, then click Record.
+
+See the [Whisper docs](https://github.com/openai/whisper) for more information about the model types, languages, and tasks.
+
+### Record audio playing from computer
+
+To record audio playing out from your computer, you'll need to install an audio loopback driver (a program that lets you create virtual audio devices). The rest of this guide will use [BlackHole](https://github.com/ExistentialAudio/BlackHole) on Mac, but you can use other alternatives for your operating system (see [LoopBeAudio](https://nerds.de/en/loopbeaudio.html), [LoopBack](https://rogueamoeba.com/loopback/), and [Virtual Audio Cable](https://vac.muzychenko.net/en/)).
+
+1. Install [BlackHole via Homebrew](https://github.com/ExistentialAudio/BlackHole#option-2-install-via-homebrew)
+
+```shell
+brew install blackhole-2ch
+```
+
+2. Open Audio MIDI Setup from Spotlight or from `/Applications/Utilities/Audio Midi Setup.app`.
+
+![](https://existential.audio/howto/img/spotlight.png)
+
+3. Click the '+' icon at the lower left corner and select 'Create Multi-Output Device'.
+
+![](https://existential.audio/howto/img/createmulti-output.png)
+
+4. Add your default speaker and BlackHole to the multi-output device.
+
+![Screenshot of multi-output device](https://existential.audio/howto/img/multi-output.png)
+
+5. Select this multi-output device as your speaker (application or system-wide) to play audio into BlackHole.
+
+6. Open Buzz, select BlackHole as your microphone, and record as before to see transcriptions from the audio playing through BlackHole.
+
 ## Build
 
-To build Buzz, run:
+To build Buzz, install the dependencies:
+
+```shell
+# using pip
+pip install .
+
+# using poetry
+poetry install
+```
+
+Then run:
 
 ```shell
-pip install -r requirements.txt
 make buzz
 ```