Initial commit: Add CEC control script for Raspberry Pi 4

- Add cec-control.sh with power, volume, and input commands
- Add README with installation and usage instructions

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,15 @@
+# Backup files
+*.bak
+*~
+
+# Editor files
+*.swp
+*.swo
+.*.swp
+.*.swo
+.vscode/
+.idea/
+
+# OS files
+.DS_Store
+Thumbs.db