Hashtable.py

[huzaifarehman1]

Description

completed implementation of hashtable from scratch #464

Checklist:

• [x] My code follows the style guidelines of this project i.e. Pep8
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have squashed unnecessary commits