Release version 0.1

This is the first release version of the lib. With this version, the following features are delivered

• Rendering timeline data
  • Allowing multiple layers
  • Allowing multiple sections per layer
  • Section data is represented using std::chrono units
  • Layers may have their specific color
• Rendering timestamp header
• Rendering guidelines per timestamp division
• Scrolling the content

What's Changed

• Implement timestamp header by @arsdever in #6
• Implement scrolling functionality by @arsdever in #7
• Implement scale functionality by @arsdever in #8

Full Changelog: https://github.com/arsdever/qtimeline/commits/v0.1