chore: Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug, triage
+assignees: ''
+
+---
+
+**Previous issues**
+Have you searched the issue tracker to ensure this hasn't been discussed before?
+
+**Version information:**
+ - OS: (e.g. MacOS ARM, Windows x64)
+ - PactNet Version:
+ - .Net Version:
+ - Pact Broker Version (if applicable):
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Steps To Reproduce**
+Steps to reproduce the issue, including code snippets or preferably a link to a repository which reproduces the issue.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Log Output**
+Applicable log output. Please ensure you remove any sensitive information.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: 'RFC: <title>'
+labels: triage
+assignees: ''
+
+---
+
+**Previous issues**
+Have you searched the issue tracker to ensure this hasn't been discussed before?
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Breaking Changes**
+Does your proposed change include anything which would require a major version bump? If so, please detail them here. Please read the SemVer spec if you are unsure what this means.
+
+**Potential Downsides/Caveats**
+A clear and concise description of any downsides or caveats your change would introduce.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.