Update issue templates

Author: lenchen1112

.github/ISSUE_TEMPLATE/pr-template.md

@@ -0,0 +1,11 @@
+---
+name: PR template
+about: Describe what content should you fill in when sending a PR
+title: "[MATCHED ARTICLE TITLE]"
+labels: needs +1, proofreading needed
+assignees: ''
+
+---
+
+Indicate folder directory which you are translating.
+e.g. `1-js/01-getting-started/4-devtools`