Update issue templates

Author: khoakomlem

.github/ISSUE_TEMPLATE/plugin-request.md

@@ -0,0 +1,14 @@
+---
+name: Plugin request
+about: Describe the idea about your new plugin
+title: ''
+labels: plugin
+assignees: ''
+
+---
+
+- Plugin name: 
+- How's it work: 
+- Why we should adding it:
+
+Thanks.