Adding issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug encountered while operating fluent-plugin-kubernetes-metrics
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Please use this template while reporting a bug and provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner. Thanks!
+
+Please do not report security vulnerabilities with public GitHub issue reports. Please report security issues here: https://www.splunk.com/goto/report_vulnerabilities_prodsec
+-->
+
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- Kubernetes version (use `kubectl version`):
+- Ruby version (use `ruby --version`):
+- OS (e.g: `cat /etc/os-release`):
+- Splunk version:
+- Others:

.github/ISSUE_TEMPLATE/enhancement_request.md

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+---
+name: Enhancement Request
+about: Suggest an enhancement to the fluent-plugin-kubernetes-metrics project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<<!-- Please only use this template for submitting enhancement requests -->
+
+**What would you like to be added**:
+
+**Why is this needed**:

.github/ISSUE_TEMPLATE/failing_test.md

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+---
+name: Failing Test
+about: Report test failures in fluent-plugin-kubernetes-metrics
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Please only use this template for submitting reports about failing tests -->
+
+**Which test(s) are failing**:
+
+**Since when has it been failing**:
+
+**Reason for failure**:
+
+**Anything else we need to know**: