Add CODEOWNERS and ISSUE_TEMPLATE (leaderboardsgg#8)

.github/CODEOWNERS

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+* @leaderboardsgg/backend-team

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: 'Bug: {short description}'
+labels: bug, needs triage
+assignees: ''
+
+---
+
+{Summary of bug}
+
+### Step(s) to Reproduce
+{Numbered list of step(s)}
+
+### Expected Result
+{Summary of expected result}
+
+### Actual Outcome
+{Description of actual outcome}

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea to add support for to this project
+title: 'Feature Request: {short description}'
+labels: enhancement, needs triage
+assignees: ''
+
+---
+
+{Detailed description}
+
+### Affected Functionality
+{Any known functionality impacted, or Unknown if further research needs to be done}
+
+### Other Relevant Issues
+{Links to Relevant Issues}

.github/ISSUE_TEMPLATE/suggest-a-task.md

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+---
+name: Suggest a task
+about: Suggest an idea for improving this project without changing functionality
+title: 'Task: {short description}'
+labels: 'needs triage'
+assignees: ''
+
+---
+
+{Detailed description}
+
+### Affected Functionality
+{Any known functionality impacted, or Unknown if further research needs to be done}
+
+### Other Relevant Issues
+{Links to Relevant Issues}