Add: Software Engineering topic, 2 research papers (#543)

software_engineering/README.md

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+## Software Engineering 
+
+* [Studying Attitudes and Social Norms in Agile Software Development (2019)](https://arxiv.org/pdf/1904.09225.pdf) by Lucas Gren
+    > This paper reviews research on attitudes and social norms and connect it to the agile software development context. Author proposes additional theories from social psychology that would most certainly be useful for further sense-making of human factors-related research on agile teams.
+
+* [Happiness and the productivity of software engineers (2019)](https://arxiv.org/ftp/arxiv/papers/1904/1904.08239.pdf) by Daniel Graziotin & Fabian Fagerholm
+    > This paper provides an overview of studies on the happiness of software developers. You will learn why it is important to make software developers happy, how happy they really are, what makes them unhappy, and what is expected for their productivity while developing software.