Start using new GitHub support for issue templates

This commit introduces 2 issue "types", feature request and bug report.

Ref: https://blog.github.com/2018-05-02-issue-template-improvements/

.github/ISSUE_TEMPLATE.md

@@ -1,13 +1,3 @@
 * Pip version:
 * Python version:
 * Operating system:
-
-### Description:
-
-// REPLACE ME: What are you trying to get done, what has happened, what went wrong, and what did you expect?
-
-### What I've run:
-
-```
-// REPLACE ME: Paste a log of command(s) you ran and pip's output, tracebacks, etc, here
-```

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,33 @@
+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Environment**
+
+* pip version:
+* Python version:
+* OS:
+
+<!-- Feel free to add more information about your environment here -->
+
+**Description**
+<!-- A clear and concise description of what the bug is. -->
+
+**Expected behavior**
+<!-- A clear and concise description of what you expected to happen. -->
+
+**How to Reproduce**
+<!-- Describe the steps to reproduce this bug. -->
+
+1. Get package from '...'
+2. Then run '...'
+3. An error occurs.
+
+**Output**
+
+```
+Paste the output of the steps above, including the commands themselves and
+pip's output/traceback etc.
+```

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,17 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**What's the problem this feature will solve?**
+<!-- A clear and concise description of what the problem is. -->
+
+**Describe the solution you'd like**
+<!-- A clear and concise description of what you want to happen. -->
+
+**Alternative Solutions**
+<!-- A clear and concise description of any alternative solutions or features you've considered. -->
+
+**Additional context**
+<!-- Add any other context, links, etc. about the feature here. -->