Add issue templates

Author: smaillet

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG] - Title"
+labels: bug
+assignees: ''
+
+---
+
+Please provide the following information when submitting an issue. 
+
+> Where appropriate replace the `[ ]` with a `[X]` to mark an item as 'checked'
+
+**.NET Framework Used:**
+
+- [ ] .NET Core 3.0.0
+- [ ] .NET Core 3.1.0
+- [ ] Something else
+
+**OS Environment:**
+
+- [ ] Windows 10
+- [ ] Windows 10 IoT Core
+- [ ] Windows Server 2012
+- [ ] Windows Server 2012 R2
+- [ ] Windows Server 2016
+
+OS Version: `####.####...`
+
+**I have already...**
+
+- [ ] Reproduced the problem using the latest stable release.
+- [ ] Reviewed the [documentation](https://ubiquitydotnet.github.io/Llvm.NET/).
+- [ ] Reviewed the [current issues](https://github.com/UbiquityDotNET/Llvm.NET/issues) to check that the issue isn't already known.
+
+**Description:**
+
+Provide a clear and concise description of what the bug is.
+
+**Steps to reproduce the problem:**
+
+- [ ] Reviewed the [documentation](https://ubiquitydotnet.github.io/Llvm.NET/).
+- [ ] Included Sample code or link to repository/gist to reproduce the bug (This is the fastest way to a resolution as it reduces the time to reproduce the problem. The smaller the sample is the better.) 
+      
+**Expected Behavior**
+
+Please provide a clear and concise description of what you expected to happen.
+
+**Actual Behavior**
+
+Please provide a clear and concise description of what actually happens.
+
+**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: "[Feature] - Title"
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+> NOTE: Feature requests are intended to request a new feature or a change in the intended/designed
+> functionality (a.k.a. DCR). They should not be used to report bugs, which are incorrect implementations
+> of the designed functionality,
+
+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.
+
+**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.