Added Exercise 1 files

Exercise_1/IntroML_Exercise1.pdf

Exercise_1/data/contrast.jpg

Exercise_1/data/hello.png

Exercise_1/data/hello_gaussian.png

Exercise_1/data/hello_poisson.png

Exercise_1/data/hello_salt_pepper.png

Exercise_1/data/hello_uniform.png

Exercise_1/data/kitty.png

Exercise_1/data/runes.png

Exercise_1/histogram_equalization.py

Exercise_1/noise.py

Exercise_1/otsu.py