chore: add contributing guide

.github/CONTRIBUTING.md

@@ -0,0 +1,25 @@
+## How to contribute
+
+### Did you find a bug?
+
+* **Ensure the bug was not already reported** by searching on GitHub under [Issues](https://github.com/golangci/golangci-lint-action/issues).
+
+* If you're unable to find an open issue addressing the problem, [open a new one](https://github.com/golangci/golangci-lint-action/issues/new).
+  Be sure to include a **title and clear description**, as much relevant information as possible,
+  and a **code sample** or an **executable test case** demonstrating the expected behavior that is not occurring.
+
+* **Do not open up a GitHub issue if the bug is a security vulnerability**,
+  and instead to refer to our [security policy](https://github.com/golangci/golangci-lint-action?tab=security-ov-file).
+
+### Do you intend to add a new feature or change an existing one?
+
+* Suggest your change inside an [issue](https://github.com/golangci/golangci-lint-action/issues).
+
+* Do not open a pull request on GitHub until you have collected positive feedback about the change.
+
+### Did you write a patch that fixes a bug?
+
+* Open a new GitHub pull request with the patch.
+
+* Ensure the PR description clearly describes the problem and solution.
+  Include the relevant issue number if applicable.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -36,14 +36,29 @@ body:
       required: true
 
   - type: textarea
-    id: config
+    id: workflow-file
     attributes:
       label: Workflow file
       value: |-
         <details>
 
+        ```yml
+        <add your file content here>
         ```
-        <add you file here>
+
+        </details>
+    validations:
+      required: true
+
+  - type: textarea
+    id: config
+    attributes:
+      label: Golangci-lint configuration
+      value: |-
+        <details>
+
+        ```yml
+        <add your file content here>
         ```
 
         </details>