Update README.md to include Practice quiz

Update README.md to include Practice quiz so that one do not have to open attached image individually. 

so, lets say we have 5 image that all 5 will show once after another in readme file itself - ease of use. 

Please approve.

C1 - Supervised Machine Learning - Regression and Classification/week2/Practice quiz - Gradient descent in practice/README.md

 ![](/C1%20-%20Supervised%20Machine%20Learning%3A%20Regression%20and%20Classification/week2/Practice%20quiz%3A%20Gradient%20descent%20in%20practice/ss1.png)
 ![](/C1%20-%20Supervised%20Machine%20Learning%3A%20Regression%20and%20Classification/week2/Practice%20quiz%3A%20Gradient%20descent%20in%20practice/ss2.png)
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+# Gradient Descent in Practice
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+![Gradient Descent in Practice](/C1%20-%20Supervised%20Machine%20Learning%20-%20Regression%20and%20Classification/week2/Practice%20quiz%20-%20Gradient%20descent%20in%20practice/ss1.png) 
+![Gradient Descent in Practice](/C1%20-%20Supervised%20Machine%20Learning%20-%20Regression%20and%20Classification/week2/Practice%20quiz%20-%20Gradient%20descent%20in%20practice/ss2.png)
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