Setup Error and lack of instructions

In the README.md, there is some examples show how to use trae-cli, but I didn't see any instruction about trae-cli installation. I run pip install trae-cli and got

ERROR: Could not find a version that satisfies the requirement trae-cli (from versions: none)
ERROR: No matching distribution found for trae-cli

I run uv sync to successfully install all dependencies, but when I run python trae_agent/cli.py, it shows this error

Traceback (most recent call last):
  File "/Users/tempest/Documents/AI/trae-agent/trae_agent/cli.py", line 12, in <module>
    import click
ModuleNotFoundError: No module named 'click

I want to know more about how to correctly setup this agent.
By the way, I read the implementation, it is so efficient, I am amazed at the elegance, simplicity, and effectiveness of the trae agent's design.