chore(chore): add github stale bot (#134)

Added stale.yml file to configure stale options

GH-133

.github/stale.yml

@@ -0,0 +1,34 @@
+# Label to use when marking an issue or a PR as stale
+staleLabel: stale
+
+# Configuration for issues
+issues:
+  # Number of days of inactivity before an issue becomes stale
+  daysUntilStale: 90
+  # Comment to post when marking an issue as stale. Set to `false` to disable
+  markComment: >
+    This issue has been marked stale because it has not seen any activity within
+    three months. If you believe this to be an error, please contact one of the code owners.
+    This issue will be closed within 15 days of being stale.
+  # Number of days of inactivity before a stale issue is closed
+  daysUntilClose: 15
+  # Comment to post when closing a stale issue. Set to `false` to disable
+  closeComment: >
+    This issue has been closed due to continued inactivity. Thank you for your understanding.
+    If you believe this to be in error, please contact one of the code owners.
+# Configuration for pull requests
+pulls:
+  # Number of days of inactivity before a PR becomes stale
+  daysUntilStale: 60
+  # Comment to post when marking a PR as stale. Set to `false` to disable
+  markComment: >
+    This pull request has been marked stale because it has not seen any activity
+    within two months. It will be closed within 15 days of being stale
+    unless there is new activity.
+  # Number of days of inactivity before a stale PR is closed
+  daysUntilClose: 15
+  # Comment to post when closing a stale issue. Set to `false` to disable
+  closeComment: >
+    This pull request has been closed due to continued inactivity. If you are
+    interested in finishing the proposed changes, then feel free to re-open
+    this pull request or open a new one.