chore: add issue and PR templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'to triage'
+assignees: ''
+
+---
+
+**Describe the bug**
+
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+```ts
+import { serve } from "https://deno.land/[email protected]/http/server.ts";
+import { Server } from "https://deno.land/x/[email protected]/mod.ts";
+
+const io = new Server();
+
+io.on("connection", (socket) => {
+  console.log(`socket ${socket.id} connected`);
+
+  socket.emit("hello", "world");
+
+  socket.on("disconnect", (reason) => {
+    console.log(`socket ${socket.id} disconnected due to ${reason}`);
+  });
+});
+
+await serve(io.handler(), {
+  port: 3000,
+});
+```
+
+**Expected behavior**
+
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+
+If applicable, add screenshots to help explain your problem.
+
+**Platform:**
+
+- Device: [e.g. Samsung S8]
+- OS: [e.g. Android 9.2]
+
+**Additional context**
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Ask a Question
+    url: https://github.com/socketio/socket.io-deno/discussions/new?category=q-a
+    about: Ask the community for help

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: 'enhancement'
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+
+A clear and concise description of what the problem is. Ex. I'm always
+frustrated when [...]
+
+**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/PULL_REQUEST_TEMPLATE/bug_fix.md

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+---
+name: Bug fix
+about: A fix for a known issue
+title: ''
+labels: 'to triage'
+assignees: ''
+
+---
+
+Related issue or discussion:

.github/PULL_REQUEST_TEMPLATE/feature.md

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+---
+name: Feature implementation
+about: A new awesome feature
+title: ''
+labels: 'enhancement'
+assignees: ''
+
+---
+
+Related issue or discussion:
+
+**New behavior**
+
+```ts
+import { serve } from "https://deno.land/[email protected]/http/server.ts";
+import { Server } from "https://deno.land/x/[email protected]/mod.ts";
+
+const io = new Server();
+
+io.on("connection", (socket) => {
+  console.log(`socket ${socket.id} connected`);
+
+  socket.emit("hello", "world");
+
+  socket.on("disconnect", (reason) => {
+    console.log(`socket ${socket.id} disconnected due to ${reason}`);
+  });
+});
+
+await serve(io.handler(), {
+  port: 3000,
+});
+```