Add motivation section

README.md

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+
+## Motivation
+
+> Learn how to design large scale systems from the open source community.
+>
+> Understand real-world architectures.
+>
+> Prep for the system design interview.
+
+### Learn how to design large scale systems
+
+Learning how to design scalable systems will make you a better engineer.
+
+System design is a broad topic.  There is a **vast amount of resources scattered throughout the web** on system design principles.
+
+This repo is an **organized collection** of resources to help you learn how to build systems at scale.
+
+Topics for learning system design:
+
+* [System design topic summaries](#index-of-system-design-topics)
+* [Real world architectures](#real-world-architectures)
+* [Engineering blogs](#company-engineering-blogs)
+
+#### Learn from the open source community
+
+This is an **early draft** of a **continually updated, open source** project.
+
+[Contributions](#contributin) are welcome!