Add .gitignore file to exclude unnecessary files from version control

.gitignore

+# Ignore ROS 2 build artifacts
+workspaces/**/build/
+workspaces/**/install/
+workspaces/**/log/
+
+# Ignore colcon and CMake temporary files
+colcon.meta
+colcon_release.meta
+CMakeLists.txt.user
+*.swp
+*.swo
+
+# Ignore Python cache and virtual environments
+workspaces/**/__pycache__/
+workspaces/**/*.pyc
+workspaces/**/.venv/
+workspaces/**/venv/
+
+# Ignore hidden system files (Mac & Linux)
+.DS_Store
+*.bak
+*.tmp
+
+# Ignore VS Code, CLion, and JetBrains IDE settings
+.vscode/
+.idea/
+workspaces/**/.vscode/
+workspaces/**/.idea/
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