chore: issue template

Author: yyx990803

.github/issue_template.md

@@ -0,0 +1,10 @@
+<!--
+If reporting a bug, please make sure to provide the following:
+
+- Your OS
+- Node.js version
+- VuePress version
+- Browser version
+- Is this a global or local install?
+- Which package manager did you use for the install?
+-->