added readme (#84)

Author: mernit

image_generation/clarity_upscaler/README.md

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+## Clarity Upscaler
+
+1. Install [Beam](https://beam.cloud) on your computer
+2. Clone this repo
+3. Deploy the clarity-upscaler: `beam deploy app.py:clarity_upscaler_server`
+
+Once deployed, you can access the API through your browser, or via API. `test.py` shows an example API call to the clarity upscaler.