Change password functionality added

[somya51p]

Related Issue

• This PR is for issue numbered Editing Profile and changing password functionality #42.

Closes: #42

Describe the changes you've made

I have added a class in views.py for changing password functionality.

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.

@harsh-9in Please review the same. and also if you want that I do this same functionality using forms notify me. I will change because the code will become more sorted.