chore: update issue template (#1049)

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,15 @@
+<!--
+IMPORTANT: Please use the following link to create a new issue:
+
+  https://elementui.github.io/issue-generator/#/en-US?repo=element-plus
+
+If your issue was not created using the app above, it will be closed immediately.
+
+########
+
+重要: 请使用以下链接创建新 issue
+
+  https://elementui.github.io/issue-generator/#/zh-CN?repo=element-plus
+
+未通过以上链接创建的 issue 会被机器人直接关闭。
+-->

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: true
+contact_links:
+  - name: Create new issue
+    url: https://elementui.github.io/issue-generator/#/en-US?repo=element-plus
+    about: The issue which is not created via https://elementui.github.io/issue-generator will be closed immediately.