Add issue templates

.github/ISSUE_TEMPLATE/anything_else.md

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+---
+name: Anything else
+about: File any other type of issue
+title: ''
+assignees: ''
+
+---

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Let us know about a bug
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+
+As clearly as you can, please tell us what the bug is.
+
+**To Reproduce**
+
+Help us to reproduce the buggy behavior. Ideally, you'd provide a
+self-contained test that shows us the bug:
+
+```bash
+mkdir tmp && cd ./tmp
+go mod init example
+go get github.com/bufbuild/connect-go
+touch example_test.go
+```
+
+And in `example_test.go`:
+
+```go
+package bugreport
+
+func TestThatReproducesBug(t *testing.T) {
+  // your reproduction here
+}
+```
+
+**Environment (please complete the following information):**
+- `connect-go` version or commit: (for example, `v0.1.0` or `5bfc7a1b440ebffdc952d813332e3617ca611395`)
+- `go version`: (for example, `go version go1.18.3 darwin/amd64`)
+- your complete `go.mod`:
+
+```go
+```
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature or improvement
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+What's the problem? For example, "I'm always frustrated when..."
+
+**Describe the solution you'd like**
+What would you like to have `connect-go` do? How should we solve the problem?
+
+**Describe alternatives you've considered**
+If you've proposed a solution, are there any alternatives? Why are they worse
+than your preferred approach?
+
+**Additional context**
+Add any other context or screenshots about the feature request here.