Added Floyd's algorithm

[Madhu-ram06]

Added Floyd's Algorithm program in C to the Graphs Folder

[rakesh0x7]

Hey! could you please raise an issue with problem link and then create a PR

• add problem link in the code too
• you need to add your file in a particular
• Algo type
  • Algo name
  • file

I'm closing this PR for now!

• you can look at this PR #99