[Doc][Developer] Documentation about how to run test

### Search before asking

- [X] I had searched in the [feature](https://github.com/apache/incubator-hugegraph-toolchain/issues?q=is%3Aissue+label%3A%22Feature%22) and found no similar feature requirement.

### Feature Description (功能描述)

Currently, it's little bit of complexity for developer who wants run test locally.

For example, I want to run client's test, and fund it relying on hugegraph server. Okay, then I start HugeGraph server, the test still failed. Then I took a look to it's CI, and fund [this script](https://github.com/apache/incubator-hugegraph-toolchain/blob/master/hugegraph-client/assembly/travis/install-hugegraph-from-source.sh) which can not run directly on local.

Running tests is a good approach to understand the code, maybe we should provide some documentations and scripts for developers that teach how to test locally?

### Are you willing to submit a PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)