added issue/pr templates

.github/ISSUE_TEMPLATE.md

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+***Note*: for support questions, please ask on StackOverflow: https://stackoverflow.com/questions/tagged/serilog . This repository's issues are reserved for feature requests and bug reports.**
+
+**Do you want to request a *feature* or report a *bug*?**
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+
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+**What is the current behavior?**
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+
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+**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem**
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+
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+**What is the expected behavior?**
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+
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+**What is the motivation / use case for changing the behavior?**
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+
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+**Which versions of Serilog, and which platform / OS are affected by this issue? Did this work in previous versions of Serilog?**
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+**Other information (e.g. stacktraces, related issues, suggestions how to fix)**

.github/PULL_REQUEST_TEMPLATE.md

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+**What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)**
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+
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+**What is the current behavior? (You can also link to an open issue here)**
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+**What is the new behavior (if this is a feature change)?**
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+**Does this PR introduce a breaking change?**
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+
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+**Please check if the PR fulfills these requirements**
+- [ ] The commit follows our guidelines: https://github.com/serilog/serilog#contribute
+- [ ] Tests for the changes have been added (for bug fixes / features)
+- [ ] Docs have been added / updated (for bug fixes / features)
+
+**Other information**:
+