add issue templates for docs

.github/ISSUE_TEMPLATE/docmentation_issue.yml

@@ -0,0 +1,19 @@
+name: "📚 Documentation Issue"
+description: "report documentation issues, typos welcome!"
+title: "[Doc]"
+labels:
+  - "documentation"
+body:
+- type: markdown
+  attributes:
+    value: "Please make sure to [search for existing issues](https://github.com/lencx/ChatGPT/issues) before creating a new one."
+- type: textarea
+  id: doc-description
+  attributes:
+    label: "Provide a description of requested docs changes"
+    description: "Briefly describe the requested docs changes."
+  validations:
+    required: true
+- type: markdown
+  attributes:
+    value: Please limit one request per issue.