add codeowners.md, constributing.md and stale issues action

.github/CODEOWNERS.md

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+* @Adyen/ipp-mobile-ios

.github/CONTRIBUTING.md

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+# Contributing to Adyen
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+The following is a set of guidelines for contributing to Adyen and its repositories, which are hosted in the [Adyen Organization](https://github.com/adyen) on GitHub. These are mostly guidelines, not rules.
+
+## Code of Conduct
+This project and everyone participating in it is governed by the [Adyen Code of Conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code.
+
+## How to contribute
+1. Fork the repository.
+2. Create a new branch from the default branch in your repository. This makes it easier for you to keep track of your changes.
+3. Make the desired changes to the code.
+    * If you are adding new functionality or fixing a bug, we recommend you add unit tests that cover it.
+4. Push the changes to your fork.
+5. Create a pull request to the repository.
+6. In your pull request, please describe in detail:
+    * What problem you’re solving
+    * Your approach to fixing the problem
+    * Any tests you wrote
+7. Check Allow edits from maintainers.
+8. Create the pull request.
+9. Ensure that all checks have passed.
+
+After you create your pull request, one of the code owners will review your code.
+We aim to review your request within 2-3 business days.

.github/workflows/stale_issues_bot.yml

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+name: Github Stale Issues Check
+
+on:
+  schedule:
+    - cron: '59 23 * * *'  # Run every day just before midnight
+
+jobs:
+  close_stale_prs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Close stale issues
+        uses: actions/stale@v9
+        with:
+          any-of-labels: 'Needs more info'
+          stale-issue-message: 'This issue is stale because it has been open 21 days with no activity. Please comment on this issue otherwise it will be closed in 7 days.'
+          close-issue-message: 'This issue was closed because it has been stalled for 7 days with no activity.'
+          days-before-issue-stale: 21
+          days-before-issue-close: 7