docs: linking contributing page (#889)

Linking contributing page to mkdocs.yml

Author: harshilgajera-crest

docs/contributing.md

@@ -94,6 +94,7 @@ poetry run mkdocs serve -a localhost:8001
 
 You can create an [issue](https://github.com/splunk/pytest-splunk-addon/issues) on GitHub.
 Please provide relevant details mentioned below:
+
 - PSA-version, OS/Environment
 - Description of issue/bug
 - How to reproduce

mkdocs.yml

@@ -73,4 +73,5 @@ nav:
       - AppTestGenerator: "api_reference/app_test_generator.md"
       - DataGenerator: "api_reference/sample_generation.md"
       - EventIngestor: "api_reference/event_ingestion.md"
-  - Troubleshooting: "troubleshoot.md"
+  - Contributing: "contributing.md"
+  - Troubleshooting: "troubleshoot.md"