chore: add issue templates. (go-acme#1368)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+labels: bug
+
+---
+<!-- PLEASE FOLLOW THE ISSUE TEMPLATE TO HELP TRIAGE AND SUPPORT! -->
+
+- [ ] Yes, I'm using a binary release within 2 latest releases.
+- [ ] Yes, I've searched similar issues on GitHub and didn't find any.
+- [ ] Yes, I've included all information below (version, config, etc).
+
+### What did you expect to see?
+
+
+### What did you see instead?
+
+
+### Steps to reproduce
+
+1. ...
+2. ...
+3. ...
+
+### Details
+
+<details><summary>Version of lego</summary>
+
+```console
+$ lego --version
+# paste output here
+```
+
+</details>
+
+<details><summary>Logs</summary>
+
+```console
+# paste output here
+```
+
+</details>

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: lego documentation
+    url: https://go-acme.github.io/lego/
+    about: Please take a look to our documenation.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+<!-- PLEASE FOLLOW THE ISSUE TEMPLATE TO HELP TRIAGE AND SUPPORT! -->
+
+- [ ] Yes, I've searched similar issues on GitHub and didn't find any.
+
+### Detailed Description
+

.github/ISSUE_TEMPLATE/new_dns_provider.md

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+---
+name: New DNS provider support
+about: Request for the support of a new DNS provider.
+labels: enhancement, new-provider
+
+---
+<!-- PLEASE FOLLOW THE ISSUE TEMPLATE TO HELP TRIAGE AND SUPPORT! -->
+
+- [ ] Yes, I've searched similar issues on GitHub and didn't find any.
+- [ ] Yes, the DNS provider exposes a public API.
+- [ ] Yes, I know that the lego maintainers don't have an account in all DNS providers in the world.
+- [ ] Yes, I'm able to create a pull request and be able to maintain the implementation
+- [ ] Yes, I'm able to test an implementation if someone creates a pull request to add the support of this DNS provider. 
+
+### Link to the DNS provider
+
+Put your link here.
+
+### Link to the API documentation
+
+Put your link here.
+
+### Additional Notes
+
+Your notes.