Intro & syllabus

This MR modifies the readme, adds a syllabus and base slides to match it.

content/concepts.md

+## Concepts
+
+- *Continouos Integration*: software development practice where code is integrated regularly. 
+- Integration usually includes building and testing  
+- *Continouos Deployment*: closely related to CI but also implies releasing integrated code into production
+- References: 
+  - [Martin Fowler](http://www.martinfowler.com/articles/continuousIntegration.html)
+  - [ThoughtWorks](https://www.thoughtworks.com/continuous-integration)
+  - [Agile Alliance](https://www.agilealliance.org/glossary/continuous-integration/)