Added my certificate and grades for this course

Finished PCA exercise

Finished K-means clustering part of the Exercise

Some modification to Spam/Not Spam codes

Finished Week 6 Exercises (Except the optional exercise)

Finished Optional Exercises on Exercise 5

Finished Exercise 5

Finished Back Propagation and other tasks

Finished Forward Propagation & Regulrized Cost Function

Finished the Part 2 (Forward Propagation)

Fixed some typo errors

Finished Logistic Regression Multi Class Classification (And) Modified the output of exercise 1 & 2, to show the grades

Finished Exercise 2

Finished Exercise 1