Priority Queue in Python

[noviicee]

Related Issue

Add Priority Queue [Python]

• Info about Issue or bug
  fixes Add Priority Queue [Python] #1630

Describe the changes you've made

Added code implementation of Priority queue in Python.
Updated corresponding Readme.

Language Used:

Python

Checklist:

• I have placed my code file in the (/Code) Folder e.g. If it's a Code in JAVA then I have placed my code pr_name.java file in (/Code/Java/) Directory.
• I have Added the Description, Approach, and Working of Code at the beginning of Code.
• I have added 2 or more Testcases at the Bottom side of the Code.
• I have Added Time and Space Complexity at the End of the Code.
• I have Explained the Variables use in Complexity e.g. O(n) where n is the length of an array.
• I have Updated the Readme Related to the Topics e.g., if the issue is regarding Matrix then Update the Readme.MD present in 2D_Array Folder.
• I have added Proper Comments in between the Code for Better Explanation.
• I have sorted the list of the Readme.MD where I have added the issue in the Alphabetical Order.

[github-actions]

AlgoTree team will review your PR soon. Take Care of Few of the Things where most contributors are missing out. @noviicee :)