How to create a AEM Search component

How to create a AEM Search component. I need the logic and code for the following parts.

1. Search component HTL code for Input and Results.
2. Model code for searching the "fulltext" using QueryBuilder.
3. Clientlib (if any).

These are all readily available as part of the open-source Core Components Search:

• Component HTL/Sightly script
• Sling Model interface and implementation
• Servlet for loading results
• Client-side JS and CSS/LESS code