chore(Github Actions): create stale action

Author: runjuu

.github/workflows/stale.yml

@@ -0,0 +1,16 @@
+name: "Close stale issues and PRs"
+on:
+  schedule:
+  - cron: "0 0 * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/stale@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'Hello 👋, this issue has been opened for more than 2 months with no activity on it. If the issue is still here, please keep in mind that we need community support and help to fix it! Just comment something like _still searching for solutions_ and if you found one, please open a pull request! You have 7 days until this gets closed automatically'
+        stale-pr-message: 'Hello 👋, this PR has been opened for more than 2 months with no activity on it. If you think this is a mistake please comment and ping a maintainer to get this merged ASAP! Thanks for contributing! You have 7 days until this gets closed automatically'
+        exempt-issue-label: 'Keep opened'
+        exempt-pr-label: 'Keep opened'