Add PR and issue templates (#1978)

* Add issue templates

* Add SO and Discord to issue templates

* Add a PR template

* Fix Discord invite URL in PR contact link

* Title caps bug report template

* Simplify PR template

* Simplify bug report template

* Switch Bug Report and Feature Request issue templates order

* Update PULL_REQUEST_TEMPLATE.md

* Update 01_feature_request.md

* Update 02_bug_report.md

* Update config.yml

Co-authored-by: Seth Michael Larson <sethmichaellarson@gmail.com>

.github/ISSUE_TEMPLATE/01_feature_request.md

@@ -0,0 +1,26 @@
+---
+name: 🎁 Feature Request
+about: Suggest a new feature
+---
+
+### Context
+
+What are you trying to do?
+How do you expect to do it?
+Is it something you currently cannot do?
+Is this related to an existing issue/problem?
+
+### Alternatives
+
+Can you achieve the same result doing it in an alternative way?
+Is the alternative considerable?
+
+### Duplicate
+
+Has the feature been requested before?
+If so, please provide a link to the issue.
+
+### Contribution
+
+Would you be willing to submit a PR?
+_(Help can be provided if you need assistance submitting a PR)_

.github/ISSUE_TEMPLATE/02_bug_report.md

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+---
+name: 🐞 Bug Report
+about: Something is broken
+---
+
+### Subject
+
+Describe the issue here.
+
+### Environment
+
+Describe your environment.
+At least, paste here the output of:
+
+```python
+import platform
+import urllib3
+
+print("OS", platform.platform())
+print("Python", platform.python_version())
+print("urllib3", urllib3.__version__)
+```
+
+### Steps to Reproduce
+
+A simple and isolated way to reproduce the issue. A code snippet would be great.
+
+### Expected Behavior
+
+What should happen.
+
+### Actual Behavior
+
+What happens instead.
+You may attach logs, packet captures, etc.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 📚 Documentation
+    url: https://urllib3.readthedocs.io/en/latest/
+    about: Make sure you read the relevant docs
+  - name: ❓ Ask on StackOverflow
+    url: https://stackoverflow.com/questions/tagged/urllib3
+    about: Ask questions about usage in StackOverflow
+  - name: 💬 Ask the Community
+    url: https://discord.gg/CHEgCZN
+    about: Join urllib3's Discord server

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,8 @@
+<!---
+Thanks for your contribution! ♥️
+
+If this is your first PR to urllib3 please review the Contributing Guide:
+https://urllib3.readthedocs.io/en/latest/contributing.html
+
+Adhering to the Contributing Guide means we can review, merge, and release your change faster! :)
+--->