Add Detailed Examples to the "Usage" Section in README.md

[AgumasD]

The current "Usage" section in the README.md provides minimal examples for many commands. This makes it harder for new users to understand how to use certain features of todo.txt-cli effectively, especially for commands like list, replace, and move.

Proposed Solution:
Expand the "Usage" section with more detailed and practical examples for commands. Examples should showcase real-world scenarios and highlight edge cases where applicable. This will improve clarity and usability for both new and experienced users.

Suggested Additions:

Add examples for filtering tasks using list with multiple terms.
Include a practical example for replacing a task using replace.
Provide an example for moving tasks between files with the move command.
Add detailed examples for other frequently used commands like pri and append.