CPUalgorithms abstract - "mother" - runnable class

Describe your change:

Compressed CPU algorithms (First Fit, Best Fit, Worst Fit ) into one class. The class CPUalgorithms is abstract so that fitProcess and printMemoryAllocation methods are implemented in each algorithm differently. Use of inheritance among the class CPUalgorithms and the three algorithm's classes. The class CPUalgorithms is runnable in order to test algorithms.

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

References

Checklist:

• I have readCONTRIBUTING.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 containsFixes: #{$ISSUE_NO}.