ADD: Issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,34 @@
+name: "Bug report"
+labels: [bug]
+description: Report a bug or unexpected behavior
+body:
+- type: markdown
+  attributes:
+    value: |
+      Before filling a new bug, please use the [search form](https://doublecmd.sourceforge.io/mantisbt/view_all_bug_page.php) to try to locate similar bugs at the old bug tracker.
+      See [Making a bug report](https://github.com/doublecmd/doublecmd/wiki/Making-a-bug-report) page for guidelines on how to make a good bug report.
+
+- type: textarea
+  attributes:
+    label: Version
+    placeholder: |
+      Double Commander
+      Version: 1.0.9
+      Revision: 222
+      Commit: a844456e4
+      Build date: 2022/12/03
+      Lazarus: 2.2.5.0
+      FPC: 3.2.2
+      Platform: x86_64-Win64-win32/win64
+      OS version: Windows 10 22H2 x86_64
+    description: |
+      Choose `Menu → Help → About` to find out.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Description
+    placeholder: Detailed description
+  validations:
+    required: true

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,6 @@
+blank_issues_enabled: true
+
+contact_links:
+  - name: I have a question about Double Commander
+    url: https://github.com/doublecmd/doublecmd/discussions
+    about: Please use GitHub Discussions to ask questions

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,22 @@
+name: "Feature request"
+labels: [enhancement]
+description: Suggest a new feature or improvement
+body:
+- type: markdown
+  attributes:
+    value: |
+      Before filling a new feature request, please use the [search form](https://doublecmd.sourceforge.io/mantisbt/view_all_bug_page.php) to try to locate similar features at the old bug tracker.
+
+- type: textarea
+  attributes:
+    label: Description
+    placeholder:
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Proposed technical implementation details (optional)
+    placeholder:
+  validations:
+    required: false