Add README

README.md

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+# Just Tell Me!
+
+<a href="https://fresh.deno.dev">
+  <img
+    width="197"
+    height="37"
+    src="https://fresh.deno.dev/fresh-badge-dark.svg"
+    alt="Made with Fresh"
+  />
+</a>
+
+Have you ever wasted some time watching a youtube video, that got you kind of
+interested because of the click-baity topic, but in the end turned out to be
+nothing more BUT click-bait? Or have you ever wanted to just quickly recall what
+a video that you've watched some time ago was about? Just Tell Me has you
+covered!
+
+Just Tell Me is an app that summarizes youtube videos using ChatGPT. It uses the
+captions provided by youtube to ask ChatGPT to summarize the content.
+
+Check it out at https://just-tell-me.deno.dev/.
+
+The core of the app is written in Typescript and relies on
+[Deno](https://docs.deno.com/runtime/manual). The web app is built with
+[Fresh](https://fresh.deno.dev/) and deployed with
+[Deno Deploy](https://deno.com/deploy).
+
+## How to run
+
+You can run the app from the CLI if you have `deno` installed:
+
+```
+deno run -A run.ts youtubeVideoId
+```
+
+The program relies on OpenAI API for ChatGPT and requires a `OPENAI_API_KEY`
+environment variable that contains a valid OpenAI API key.
+
+By default, the app uses the `gpt-3.5-turbo-1106` model, but you can also use
+`gpt-4` and `gpt-4-1106-preview`, by including a `--model=gpt-4` flag.
+
+Optionally, you can run the app in test mode (only `test` is considered a valid
+video id then) with:
+
+```
+TEST=true deno run -A run.ts test
+```
+
+To launch the web app locally, run:
+
+```
+deno task start
+```
+
+(You can also include `TEST=true` environment variable, to run the web app in
+test mode)