Add issue and pull request templates

.github/ISSUE_TEMPLATE

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+**Do you want to request a *feature* or report a *bug*?**
+
+**If the issue is a bug report, please provide the steps to reproduce it. Please include the actual command causing the issue if applicable.**
+
+<!-- Paste the command here: -->
+
+**What did you expect to happen?**
+
+**What actually happened? Please include the actual error trace and / or stack trace if applicable.**
+
+<!-- Paste the error and / or stack trace here: -->
+
+**If the issue is a feature request, what is the motivation / use case for it?**
+
+**Tell us about your environment**
+- **http-server version:**
+- **Platform:**
+
+**Other information (related issues, suggestions for a fix, etc):**
+

.github/PULL_REQUEST_TEMPLATE

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+**Please ensure that your pull request fulfills these requirements:**
+- [ ] The pull request is being made against the `master` branch
+- [ ] Tests for the changes have been added (for bug fixes / features)
+
+**What is the purpose of this pull request? (bug fix, enhancement, new feature,...)**
+
+<!--
+    Link to the issue this pull request fixes here, if applicable: "Fixes #xxx" or "Resolves #xxx"
+-->
+
+**What changes did you make?**
+
+**Provide some example code that this change will affect, if applicable:**
+
+<!-- Paste the example code here: -->
+
+**Is there anything you'd like reviewers to focus on?**
+
+**Please provide testing instructions, if applicable:**