Added Bug and Feature Request templates

Change-Id: I867cb73143e5bd0f86d1cb747e912cc75138e781

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug or unexpected image builder behavior
+title: ''
+labels: bug, triage
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Steps To Reproduce**
+Minimal steps to reproduce the issue.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment**
+- airshipctl Version:
+- image builder image Version:
+- Operating System:
+- Kernel version:
+- Kubernetes Version:
+- Go version:
+- Hardware specs (e.g. 4 vCPUs, 16GB RAM, bare metal vs VM):

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an image builder feature
+title: ''
+labels: enhancement, triage
+assignees: ''
+
+---
+
+**Problem description (if applicable)**
+A description of the problem or background information that illustrates the need
+for a new feature.
+
+**Proposed change**
+A detailed description of the new, requested behavior.
+
+**Potential impacts**
+Potential security or performance related impacts.