Create 0707-design-linked-list.rs

[isamyakt]

• File(s) Created: 0707-design-linked-list.rs
• Language(s) Used: rust
• Submission URL: https://leetcode.com/problems/design-linked-list/ //: # "Getting the Submission URL" //: # "Go to the leetcode Submissions tab" //: # "and click on the Accepted status of your submission.]" //: # "Finally copy the URL from the nav bar, it should look like https://leetcode.com/problems/design-linked-list/"

Important

Please make sure the file name is lowercase and a duplicate file does not already exist before merging.