[Proposal] Add issue templates (#446)

Add issue templates

.github/ISSUE_TEMPLATE/feature.yml

@@ -0,0 +1,34 @@
+name: Feature Request
+description: Suggest an idea for this project
+labels: ["feature"]
+assignees: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for suggesting an idea to make pg_stat_monitor better! Please complete the below form to ensure we have all the details to get things started.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Description of the feature and of the problem it solves.
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Suggested solution
+      description: A concise description of your preferred solution.
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Any information that may help.
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/percona/community/blob/main/content/contribute/coc.md)
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true