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added open with codeanywhere badge to README file #1

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9 changes: 9 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,15 @@ You can temporarily play with Lean using Github codespaces. This requires a Gith

* Make sure the Machine type is `4-core`, and then press `Create codespace`
* After 1-2 minutes you see a VSCode window in your browser. However, it is still busily downloading mathlib in the background, so give it another few minutes (5 to be safe) and then open a `.lean` file to start.
## Using Codeanywhere

You can also use Codeanywhere to work on this project. This requires a Codeanywhere account, and you can only use it for a limited amount of time each month. If you are signed in to Codeanywhere, click here:

[![Open in Codeanywhere](https://codeanywhere.com/img/open-in-codeanywhere-btn.svg)](https://app.codeanywhere.com/#https://github.com/fpvandoorn/LeanCourse23)

This creates a virtual machine in the cloud, and installs Lean and Mathlib. It then presents you with a VS Code window, running in a virtual copy of the repository. You can update the repository by opening a terminal in the browser and typing `git pull` followed by `lake exe cache get!` as above.

Codeanywhere gives you 50 free hours every month. When you are done working, choose `Stop workspace` from the menu on the left. The workspace should also stop automatically 30 minutes after the last interaction or 3 minutes after closing the tab.

### Using Gitpod

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