Describe your change:

I have added matrix multiplication algorithm using divide and conquer technique in divideconquer folder.This code will multiply two matrix using divide and conquer technique which is efficient and faster.

• Add an algorithm?
  yes added an algo.

References

Checklist:

• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Java files are placed inside an existing directory.
• All functions and variable names follow Java naming conventions.
• [] If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.