Add initial DevContainer setup and configuration files (#1)

- Create .devcontainer/devcontainer.json for container environment setup
- Add postStartCommand.sh for provisioning system dependencies and configuration
- Include .gitignore to exclude task-related files
- Create .taskrc.yml to enable experimental features
- Add Taskfile.yml for task management and configuration
- Set up VSCode settings for integrated terminal using zsh

Co-authored-by: Thomas <thomas.hochstrasser@gmx.net>
Reviewed-on: #1

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "terminal.integrated.defaultProfile.linux": "zsh"
+}