Update README

[chaoming0625]

Summary by Sourcery

Update the README file to reflect the new name "BrainUnit" and expand the project description, motivation, features, and provide a usage example.

Documentation:

• Expand the project description, motivation, and features in the README.

Tests:

• Update tests to use brainunit.math functions instead of numpy functions.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request primarily updates the README.md file to provide a more comprehensive introduction to the BrainUnit library. It includes a motivation section, a features overview, a quick example, and installation instructions. Additionally, a minor change was made in brainunit/_base_test.py to use u.math instead of np for index functions.

Flow diagram of BrainUnit's unit-aware computation

graph LR
    Input[Input with Units] --> Compute[Unit-aware Computation]
    Compute --> JAX{JAX Processing}
    JAX -->|Autograd| Result1[Result with Units]
    JAX -->|JIT| Result2[Result with Units]
    JAX -->|Vectorization| Result3[Result with Units]

    style Input fill:#f9f
    style Compute fill:#bbf
    style JAX fill:#fbb
    style Result1 fill:#bfb
    style Result2 fill:#bfb
    style Result3 fill:#bfb

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File-Level Changes

Change	Details	Files
Updated the README.md to include a more detailed introduction to the library.	Added a motivation section explaining the purpose of the library. Included a features section outlining the key capabilities of BrainUnit. Provided a quick example demonstrating the usage of the library with JAX. Added installation instructions. Updated the title and description of the library.	README.md
Modified the test file to use u.math instead of np for index functions.	Replaced np.argmin, np.argmax, np.argsort, and np.nonzero with their u.math counterparts. Replaced np.asarray with u.math.asarray.	brainunit/_base_test.py

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