chore: add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+Please fill the following code example:
+
+Socket.IO server version: `x.y.z`
+
+*Server*
+
+```js
+import { Server } from "socket.io";
+
+const io = new Server(8080);
+
+io.on("connection", (socket) => {
+  // ...
+});
+```
+
+Socket.IO java client version: `x.y.z`
+
+*Client*
+
+```java
+public class MyApplication {
+    public static void main(String[] args) throws URISyntaxException {
+        IO.Options options = IO.Options.builder()
+                .build();
+
+        Socket socket = IO.socket("http://localhost:8080", options);
+
+        socket.on(Socket.EVENT_CONNECT, new Emitter.Listener() {
+            @Override
+            public void call(Object... args) {
+                System.out.println("connect");
+            }
+        });
+
+        socket.open();
+    }
+}
+```
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**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/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/ISSUE_TEMPLATE/question.md

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+---
+name: Ask a Question
+about: Ask the community for help
+title: ''
+labels: 'question'
+assignees: ''
+
+---
+