ci - Add github config for welcome and stale bot (#118)

Author: phibos

.github/config.yml

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+# SPDX-FileCopyrightText: none
+# SPDX-License-Identifier: CC0-1.0
+
+# Configuration for new-issue-welcome - https://github.com/behaviorbot/new-issue-welcome
+
+# Comment to be posted to on first time issues
+newIssueWelcomeComment: >
+  Thanks for opening your first issue here! Be sure to follow the issue template!
+
+# Configuration for new-pr-welcome - https://github.com/behaviorbot/new-pr-welcome
+
+# Comment to be posted to on PRs from first time contributors in your repository
+newPRWelcomeComment: >
+  Welcome to the community and thanks for opening your first pull request.
+  Feel free to look for more issues to tackle at https://github.com/DinoTools/python-ssdeep/issues
+
+# Configuration for first-pr-merge - https://github.com/behaviorbot/first-pr-merge
+
+# Comment to be posted to on pull requests merged by a first time user
+# firstPRMergeComment: >
+#   Congrats on merging your first pull request! We here at behaviorbot are proud of you!
+
+# It is recommend to include as many gifs and emojis as possible

.github/stale.yml

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+# SPDX-FileCopyrightText: none
+# SPDX-License-Identifier: CC0-1.0
+
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 14
+
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+
+# Only issues that requires info from the op
+onlyLabels:
+  - "Status: Feedback needed"
+
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - "Priority: Critical"
+  - "Priority: Security"
+  - "Status: Confirmed"
+  - "Status: Complete"
+  - "Status: Review Needed"
+  - "Status: On Hold"
+  - "Status: In Progress"
+  - security
+
+# Label to use when marking an issue as stale
+staleLabel: "Status: Stale"
+
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity and seems to be missing some essential information. It will
+  be closed if no further activity occurs. Thank you for your contributions.
+
+# Comment to post when closing a stale issue. Set to `false` to disable
+# closeComment: false
+
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 30
+
+# Limit to only `issues` or `pulls`
+only: issues