Add issue templates.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: General bug report
+about: Error dialog, crash, or anything else unrelated to the decompiled code
+title: ''
+labels: Bug
+assignees: ''
+
+---
+
+### Steps to reproduce
+1. 
+2. 
+3. 
+
+### Error message shown
+
+```
+Copy and paste any error messages / relevant text and/or screenshot the incorrect behaviour.
+```
+
+### Details
+* Product in use: e.g. ILSpy / ICSharpCode.Decompiler nuget package / VS extension
+* Version in use: e.g. 6.0.0 or a commit hash (use Help>About to see which ILSpy version you are using)
+* Any other relevant information to the issue, or your interest in contributing a fix.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: Enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is and why it's important to you. Ex. I'm always frustrated when [...]
+Any (even unsuccessful) ways in which you've tried to workaround the problem currently
+
+**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.

.github/ISSUE_TEMPLATE/wrong_decompilation.md

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+---
+name: Wrong decompilation
+about: Decompiled code doesn't compile, or behaves differently to the original IL
+title: ''
+labels: Bug Decompiler
+assignees: ''
+
+---
+
+### Input code
+Please provide the input that failed to decompile.
+If providing IL code as input, please provide enough context to allow us to re-assemble the IL.
+If uploading a complete assembly, please mention which method failed to decompile.
+
+### Erroneous output
+```c#
+If relevant, the incorrectly decompiled output, or an exception with stack trace.
+```
+If the output fails to re-compile, provide the compiler error message.
+
+### Expected output
+```c#
+If relevant, the output you expected, or a description of what you expected.
+```
+
+### Details
+* Product in use: e.g. ILSpy / ICSharpCode.Decompiler nuget package / VS extension
+* Version in use: e.g. 6.0.0 or a commit hash (use Help>About to see which ILSpy version you are using)
+* Any other relevant information to the issue, or your interest in contributing a fix.

.github/PULL_REQUEST_TEMPLATE.md

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+Link to issue(s) this covers
+
+### Problem
+Link to, or brief information about the issue
+
+### Solution
+* Any comments on the approach taken, its consistency with surrounding code, etc.
+* Which part of this PR is most in need of attention/improvement?
+* [ ] At least one test covering the code changed
+