Configure Renovate (#1)

Welcome to [Renovate](https://github.com/renovatebot/renovate)! This is an onboarding PR to help you understand and configure settings before regular Pull Requests begin.

🚦 To activate Renovate, merge this Pull Request. To disable Renovate, simply close this Pull Request unmerged.

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### Detected Package Files

 * `go.mod` (gomod)

### What to Expect

With your current configuration, Renovate will create 2 Pull Requests:

<details>
<summary>Update module fyne.io/fyne/v2 to v2.4.5</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/fyne.io-fyne-v2-2.x`
  - Merge into: `main`
  - Upgrade [fyne.io/fyne/v2](https://github.com/fyne-io/fyne) to `v2.4.5`

</details>

<details>
<summary>Update module golang.org/x/image to v0.17.0</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/golang.org-x-image-0.x`
  - Merge into: `main`
  - Upgrade golang.org/x/image to `v0.17.0`

</details>

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❓ Got questions? Check out Renovate's [Docs](https://docs.renovatebot.com/), particularly the Getting Started section.
If you need any further assistance then you can also [request help here](https://github.com/renovatebot/renovate/discussions).

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

<!--renovate-config-hash:94693a990c975907e7f13da3309b9d56ba02b3983519b41786edf5cf031e457c-->

Reviewed-on: #1
Co-authored-by: Renovate Bot <renovate-bot@git.cantorgymnasium.de>
Co-committed-by: Renovate Bot <renovate-bot@git.cantorgymnasium.de>

renovate.json

@@ -0,0 +1,3 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+}