Dijskstra's Algorithm for shortest path added(Fixes: #2470)

[Simran1604]

Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

References

issue : #2470
Djikstra's algorithm: https://www.geeksforgeeks.org/dijkstras-shortest-path-algorithm-greedy-algo-7/

Checklist:

• I have read CONTRIBUTING.md.
• 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 filenames are in all uppercase characters with no spaces or dashes.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains
  Fixes: Dijkstras shortest path algorithm #2470 .

[Simran1604]

@siriak please approve my PR for hactoberfest21.
Thank you.

[Simran1604]

@siriak can you pls enlighten me as to why my PR is not getting merged?