updated repo description

Author: ayushi-b

README.md

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+# SQL-for-Data-Analysis
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+This repository contains the quizzes along with their SQL commands for the concepts taught in the course [SQL for Data Analysis](https://in.udacity.com/course/sql-for-data-analysis--ud198) by [MODE](https://modeanalytics.com) at [Udacity](http://udacity.com/).
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+Here is the schema of the database used for all the queries.
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+![](schema.png)
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+</br>
+I have also included the screenshots from the videos for some important and useful concepts that may need revision in future.
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+For the remaining ones, please refer these [SQL Tutorials](https://community.modeanalytics.com/sql/) (by MODE as well).
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