Initial commit: cpd-cli auto-update script

- update-cpd-cli.sh: automate CPD CLI version updates
- README.md: project documentation
- .gitignore: standard ignores

.gitignore

@@ -0,0 +1,48 @@
+# Compiled binaries/binaries
+*~
+*.o
+*.exe
+*.out
+*.so
+*.a
+
+# IDE and editor files
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+.project
+.cache
+
+# Build artifacts
+build/
+dist/
+pkg/
+*.tar.gz
+*.tgz
+*.tar
+
+# OS files
+.DS_Store
+.Spotlight-V100
+.Trashes
+.AppleDouble
+._*
+
+# Environment files
+.env
+.env.local
+.venv/
+venv/
+ENV/
+
+# OS temp files
+*.log
+npm-debug.log
+yarn-debug.log
+pids/
+
+# Temporary files
+*.tmp
+*.temp