[improvement] add bug report / feature request (#1218)

This PR adds issue templates for bug reports and feature requests.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,54 @@
+name: Bug Report
+description: File a bug report
+title: '[Bug]: '
+labels: ['bug', 'triage']
+assignees:
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: Also tell us, what did you expect to happen?
+      placeholder: ''
+      value: ''
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: How can we reproduce the bug?
+      description: If you can make the bug happen again, please share the steps involved.
+      placeholder: ''
+      value: ''
+    validations:
+      required: false
+  - type: dropdown
+    id: browsers
+    attributes:
+      label: What browsers are you seeing the problem on?
+      multiple: true
+      options:
+        - Firefox
+        - Chrome
+        - Safari
+        - Microsoft Edge
+  - type: input
+    id: contact
+    attributes:
+      label: Contact Details
+      description: How can we get in touch with you if we need more info?
+      placeholder: ex. email@example.com
+    validations:
+      required: false
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/tldraw/tldraw/blob/main/CODE_OF_CONDUCT.md)
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,35 @@
+name: Feature request
+description: File a feature request
+title: '[Feature]: '
+labels: ['feature', 'triage']
+assignees:
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Have an idea for a feature or change in tldraw?
+  - type: textarea
+    id: description
+    attributes:
+      label: What's the feature?
+      description: Describe the feature, who it would help, and link to any examples from other apps.
+      placeholder: ''
+      value: ''
+    validations:
+      required: true
+  - type: input
+    id: contact
+    attributes:
+      label: Contact Details
+      description: How can we get in touch with you if we need more info?
+      placeholder: ex. email@example.com
+    validations:
+      required: false
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/tldraw/tldraw/blob/main/CODE_OF_CONDUCT.md)
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true