Add error/success flash message on reset password and some passwords validations

[arpit456jain]

Related Issuse

Add error/success flash message on reset password and some passwords validations

Closes: #193

Describe the changes you've made

https://user-images.githubusercontent.com/55352601/118683738-41a8a380-b81f-11eb-8729-12d90a4853b4.mp4

Checklist:

• [x] My code follows the style guidelines of this project.
• [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] My changes generate no new warnings.

[arpit456jain]

@khannakshat7 please review this PR

[khannakshat7]

@arpit456jain A few things to add are-

• Pl. Add all password validations as we have in sign up form
• When the user moves to url '/reset-password' pl. check if he has passed the OTP verification or not. (I just added an email in forget email and went to localhost/reset-password without entering OTP then changed the password and it was changed).
• Some typos in the error messages.

[arpit456jain]

Ok @khannakshat7 will do this today and create a PR for this