Add .gitignore for environment, OS, and IDE files

Author: asabo-dev

youtube-relevance-finder/.gitignore

@@ -0,0 +1,21 @@
+# macOS
+.DS_Store
+
+# Environment variables
+.env
+.env.*
+
+# Python
+__pycache__/
+*.py[cod]
+
+# Virtual environments
+venv/
+.venv/
+
+# IDEs
+.vscode/
+.idea/
+
+# Logs
+*.log