Addingstaleissue (Chia-Network#304)

* adding stale issue

* fixing syntax

* fixing line endings

Co-authored-by: FirstName LastName <Email>

.github/workflows/stale-issue.yml

@@ -0,0 +1,35 @@
+---
+name: 'Close stale issues'
+on:
+  schedule:
+    - cron: '0 11 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: chia-network/stale@main
+        with:
+          operations-per-run: 10000
+          ascending: true
+          days-before-issue-stale: 14
+          days-before-issue-close: 7
+          days-before-pr-stale: 60
+          days-before-pr-close: -1
+          exempt-all-pr-milestones: true
+          exempt-all-issue-milestones: true
+          exempt-all-assignees: true
+          stale-issue-label: stale-issue
+          stale-pr-label: stale-pr
+          remove-stale-when-updated: true
+          stale-issue-message: >
+              'This issue has been flagged as stale as there has been no
+              activity on it in 14 days. If this issue is still affecting you
+              and in need of review, please update it to keep it open.'
+          close-issue-message: >
+              'This issue was automatically closed because it has been flagged
+              as stale and subsequently passed 7 days with no further activity.'
+          stale-pr-message: >
+              'This PR has been flagged as stale due to no activity for over 60
+               days. It will not be automatically closed, but it has been given
+               a stale-pr label and should be manually reviewed.'