feat: add Rust solution for lc No.0712

[yanglbme]

No description provided.

[Copilot]

Pull request overview

This PR adds a Rust solution for LeetCode problem 0712 "Minimum ASCII Delete Sum for Two Strings". The solution implements a dynamic programming approach that computes the minimum sum of ASCII values of deleted characters needed to make two strings equal.

• Implements the standard DP solution with O(m×n) time and space complexity
• Updates both English and Chinese README files with the Rust code
• Follows existing repository patterns and conventions

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
solution/0700-0799/0712.Minimum ASCII Delete Sum for Two Strings/Solution.rs	Adds Rust implementation using 2D DP table to solve the problem
solution/0700-0799/0712.Minimum ASCII Delete Sum for Two Strings/README.md	Adds Rust solution code block to Chinese documentation
solution/0700-0799/0712.Minimum ASCII Delete Sum for Two Strings/README_EN.md	Adds Rust solution code block to English documentation

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