fix: add issue template

Author: sakulstra

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Bug report
+    url: https://immunefi.com/bounty/aave/
+    about: Protocol bugs should be privately disclosed via immunify.

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,27 @@
+name: Feature request
+description: Suggest a feature
+labels: ["feature", "needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please ensure that the feature has not already been requested in the issue tracker.
+
+        Thanks for helping us improve Aave protocol V3!
+  - type: dropdown
+    attributes:
+      label: Component
+      description: What component is the feature for?
+      multiple: true
+      options:
+        - Protocol
+        - Extensions
+        - Other (please describe)
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe the feature you would like
+      description: Please also describe what the feature is aiming to solve, if relevant.
+    validations:
+      required: true