GitHub issue templates (#12617)

Issue forms for:
  - Bug reports
  - Feature requests
  - Form for adding a company to a public list of users

[ci skip-rust]

[ci skip-build-wheels]

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Help us find and fix bugs
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of the bug.
+
+**Pants version**
+Which version of Pants are you using?
+
+**OS**
+Are you encountering the bug on MacOS, Linux, or both?
+
+**Additional info**
+Add any other information about the problem here, such as attachments or links to gists, if relevant.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: The Pants Documentation Site
+    url: https://www.pantsbuild.org/
+    about: You can find a lot of useful information here.
+  - name: The Pants Community Chat
+    url: https://join.slack.com/t/pantsbuild/shared_invite/zt-d0uh0mok-RLvVosDiX6JDpvStH~bFBA
+    about: We're a friendly community, and happy to answer questions!

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest ways to improve Pants
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. E.g., It would be easier if [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/user_registration.yml

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+name: "Support Pants - list my company on pantsbuild.org"
+description: Add a company or organization to the public list of Pants Users
+title: "Please add XXXXXX to the public list of Pants Users"
+labels: [user-registration]
+assignees:
+  - benjyw
+  - cczona
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for helping grow the Pants community by being featured on the public list of Pants Users!
+  - type: input
+    id: name
+    attributes:
+      label: "Company name"
+      description: The name of your company/organization.
+      placeholder: e.g., Acme
+    validations:
+      required: true
+  - type: input
+    id: website
+    attributes:
+      label: "Company website"
+      description: Your company's main website
+      placeholder: e.g., https://www.acme.com
+    validations:
+      required: true
+  - type: textarea
+    id: logo
+    attributes:
+      label: Company logo
+      description: |
+        We'd love to use your company's logo on the Users Page!
+
+        Please ensure that you have the right to grant us permission to use the logo in
+        this manner before adding it.
+
+        If you're unsure, please submit this page without the logo, and we can revisit it later,
+        if/when permission has been established. The other information is still very helpful!
+      placeholder: Drag and drop a .jpg or .png image of your company logo into this box.
+      value:
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: |
+        After creating the issue, please email verify@pantsbuild.org from your company
+        email address with a link to the newly-created issue. That's it, and thanks again!