Add issue templates (#166)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report broken or incorrect behaviour
+labels: ["bug", "investigation needed"]
+
+body:
+  - type: markdown
+    attributes:
+      value: >
+        Thanks for taking the time to fill out a bug report!
+        
+        If you're not sure it's a bug and you just have a question, the [community Slack channel](https://join.slack.com/t/betterproto/shared_invite/zt-f0n0uolx-iN8gBNrkPxtKHTLpG3o1OQ) is a better place for general questions than a GitHub issue.
+
+  - type: input
+    attributes:
+      label: Summary
+      description: A simple summary of your bug report
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Reproduction Steps
+      description: >
+        What you did to make it happen.
+        Ideally there should be a short code snippet in this section to help reproduce the bug.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Expected Results
+      description: >
+        What did you expect to happen?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Actual Results
+      description: >
+        What actually happened?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: System Information
+      description: >
+        Paste the result of `protoc --version; python --version; pip show betterproto` below.
+    validations:
+      required: true
+
+  - type: checkboxes
+    attributes:
+      label: Checklist
+      options:
+        - label: I have searched the issues for duplicates.
+          required: true
+        - label: I have shown the entire traceback, if possible.
+          required: true
+        - label: I have verified this issue occurs on the latest prelease of betterproto which can be installed using `pip install -U --pre betterproto`, if possible.
+          required: true
+

.github/ISSUE_TEMPLATE/config.yml

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+name:
+description:
+contact_links:
+  - name: For questions about the library
+    about: Support questions are better answered in our Slack group.
+    url: https://join.slack.com/t/betterproto/shared_invite/zt-f0n0uolx-iN8gBNrkPxtKHTLpG3o1OQ

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a feature for this library
+labels: ["enhancement"]
+
+body:
+  - type: input
+    attributes:
+      label: Summary
+      description: >
+        What problem is your feature trying to solve? What would become easier or possible if feature was implemented?
+    validations:
+      required: true
+
+  - type: dropdown
+    attributes:
+      multiple: false
+      label: What is the feature request for?
+      options:
+        - The core library
+        - RPC handling
+        - The documentation
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: The Problem
+      description: >
+        What problem is your feature trying to solve?
+        What would become easier or possible if feature was implemented?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: The Ideal Solution
+      description: >
+        What is your ideal solution to the problem?
+        What would you like this feature to do?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: The Current Solution
+      description: >
+        What is the current solution to the problem, if any?
+    validations:
+      required: false