feat: add solutions for lc No.0696

[yanglbme]

No description provided.

[Copilot]

Pull request overview

This PR appears to add/introduce solution content for LeetCode 696. Count Binary Substrings under the solution/0600-0699 section of the repository.

Changes:

• Adds the problem write-up (README.md / README_EN.md) for LC 0696 with a standard “group-length counting” approach.
• Adds multi-language reference implementations for LC 0696 (C++/Go/Java/Python/Rust/TypeScript).
• Updates the solution index tables to include LC 0696 (in solution/README.md and solution/README_EN.md).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
solution/0600-0699/0696.Count Binary Substrings/README.md	Chinese problem statement + solution explanation + code tabs for multiple languages.
solution/0600-0699/0696.Count Binary Substrings/README_EN.md	English problem statement + solution explanation + code tabs for multiple languages.
solution/0600-0699/0696.Count Binary Substrings/Solution.py	Python implementation of the group-length counting solution.
solution/0600-0699/0696.Count Binary Substrings/Solution.java	Java implementation of the group-length counting solution.
solution/0600-0699/0696.Count Binary Substrings/Solution.cpp	C++ implementation of the group-length counting solution.
solution/0600-0699/0696.Count Binary Substrings/Solution.go	Go implementation of the group-length counting solution (uses min, consistent with other Go snippets in this repo).
solution/0600-0699/0696.Count Binary Substrings/Solution.ts	TypeScript implementation; appears to end the function with }; (inconsistent with other TS solutions here, which typically end with } only).
solution/0600-0699/0696.Count Binary Substrings/Solution.rs	Rust implementation of the group-length counting solution.
solution/README.md	Index row for problem 0696 in the Chinese solutions table.
solution/README_EN.md	Index row for problem 0696 in the English solutions table.

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