chore: add .gitignore for secrets and runtime files

Author: bakerboy448

.gitignore

@@ -0,0 +1,28 @@
+# Environment and secrets
+.env
+.env.*
+!.env.sample
+!.env.example
+
+# Credentials
+*.pem
+*.key
+*.crt
+credentials*
+config.json
+secrets.*
+
+# Python
+__pycache__/
+*.pyc
+*.pyo
+.venv/
+venv/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# IDE
+.vscode/
+.idea/