Add issue and PR templates (#1754)

This helps a lot to make initial user interactions at a higher quality, so maintainers don't spend as much time asking for clarifications and so on.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "\U0001F41EBug report"
+about: Report a bug in rules_docker
+---
+<!--🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅
+
+Oh hi there! 😄 
+
+To expedite issue processing please search open and closed issues before submitting a new one.
+Existing issues often contain information about workarounds, resolution, or progress updates.
+
+🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅-->
+
+
+# 🐞 bug report
+
+### Affected Rule
+
+<!-- Can you pin-point one or more rules as the source of the bug? -->
+<!-- ✍️edit: --> The issue is caused by the rule: 
+
+
+### Is this a regression?
+
+<!-- Did this behavior use to work in the previous version? -->
+<!-- ✍️--> Yes, the previous version in which this bug was not present was: ....
+
+
+### Description
+
+<!-- ✍️--> A clear and concise description of the problem...
+
+
+## 🔬 Minimal Reproduction
+
+<!--
+Please create and share minimal reproduction of the issue. For the purpose you can create a GitHub repository and share a link. Make sure you don't upload any confidential files.
+-->
+
+## 🔥 Exception or Error
+
+<pre><code>
+<!-- If the issue is accompanied by an exception or an error, please share it below: -->
+<!-- (Please run your build with --define=VERBOSE_LOGS=1 to gather more info for us to understand the problem.) -->
+<!-- ✍️-->
+
+</code></pre>
+
+
+## 🌍  Your Environment
+
+**Operating System:**
+
+<pre>
+  <code>
+
+  </code>
+</pre>
+
+**Output of `bazel version`:**
+
+<pre>
+  <code>
+
+  </code>
+</pre>
+
+**Rules_docker version:**
+
+<pre>
+  <code>
+
+  </code>
+</pre>
+
+**Anything else relevant?**
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "\U0001F680Feature request"
+about: Suggest a feature for rules_docker
+
+---
+<!--🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅
+
+Oh hi there! 😄 
+
+To expedite issue processing please search open and closed issues before submitting a new one.
+Existing issues often contain information about workarounds, resolution, or progress updates.
+
+🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅🔅-->
+
+
+# 🚀 feature request
+
+### Relevant Rules
+
+<!-- Tell us if you want to add a feature to an existing rule or add a new rule -->
+
+<!--
+
+If you're looking for a new rule first make sure you check awesome-bazel for an
+curated list of existing bazel rules https://github.com/jin/awesome-bazel
+
+If you don't find what you're looking for there, before opening a feature request make sure
+this repository is the right place for that.
+
+-->
+
+### Description
+
+<!-- ✍️--> A clear and concise description of the problem or missing capability...
+
+
+### Describe the solution you'd like
+
+<!-- ✍️--> If you have a solution in mind, please describe it.
+
+
+### Describe alternatives you've considered
+
+<!-- ✍️--> Have you considered any alternative solutions or workarounds?
+

.github/PULL_REQUEST_TEMPLATE.md

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+## PR Checklist
+
+Please check if your PR fulfills the following requirements:
+
+- [ ] Tests for the changes have been added (for bug fixes / features)
+- [ ] Docs have been added / updated (for bug fixes / features)
+
+
+## PR Type
+
+What kind of change does this PR introduce?
+
+<!-- Please check the one that applies to this PR using "x". -->
+
+- [ ] Bugfix
+- [ ] Feature
+- [ ] Code style update (formatting, local variables)
+- [ ] Refactoring (no functional changes, no api changes)
+- [ ] Build related changes
+- [ ] CI related changes
+- [ ] Documentation content changes
+- [ ] Other... Please describe:
+
+
+## What is the current behavior?
+<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
+
+Issue Number: N/A
+
+
+## What is the new behavior?
+
+
+## Does this PR introduce a breaking change?
+
+- [ ] Yes
+- [ ] No
+
+
+<!-- If this PR contains a breaking change, please describe the impact and migration path for existing applications below. -->
+
+
+## Other information
+