adding some intro text for the first lesson batch

1-Introduction/README.md

@@ -1,7 +1,9 @@
-# Introduction
-
-[Brief description about the lessons in this section]
+# Introduction to Data Science
 
+![data in action](images/data.jpg)
+>Photo by <a href="https://unsplash.com/@dawson2406?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Stephen Dawson</a> on <a href="https://unsplash.com/s/photos/data?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Unsplash</a>
+  
+In these lessons, you will discover how Data Science is defined and learn about ethical considerations that must be considered by a data scientist. You will also learn how data is defined and learn a bit about statistics and probability, the core academic domains of Data Science.
 ### Topics
 
 1. [Defining Data Science](01-defining-data-science/README.md)
@@ -11,4 +13,4 @@
 
 ### Credits
 
-
+These lessons were written with ❤️ by [Nitya Narasimhan](https://twitter.com/nitya) and [Dmitry Soshnikov](https://twitter.com/shwars).