add 'Spring Boot' course

content/courses/spring-boot/_index.md

@@ -0,0 +1,36 @@
+---
+# title: Courses
+weight: 3
+---
+
+# Prerequisites
+
+* Solid understanding of Java
+* Object-oriented programming
+* Classes, methods and interfaces
+* Basic understanding of databases
+* Tables, primary keys, foreign keys, relationships, etc.
+* Write basic SQL statements
+
+--- 
+
+# What is a Spring Framework?
+
+**Spring** -- is a popular framework for building Java applications. It has a lot of modules, each designed to handle a specific task. They are combined into few different layers.
+
+![Spring layers](assets/spring-layers.svg) 
+*Img. 1 -- Spring layers*
+
+| **Layer** | **Purpose** |
+| ------------- | -------------- | 
+| *Core* | Handling dependency injection, managing objects |
+| *Web* | Building web applications |
+| *Data* | Working with databases |
+| *AOP* | Aspect oriented programming |
+| *Test* | Testing spring components |
+
+--- 
+
+While the spring framework is powerfull, using it often involves a lot of configuration. For example, if you want to build a web app you might need to setup a web server, configure routing and manage dependencies manually. That's when **Spring Boot** comes in.
+
+You can think of spring boot as a layer on top of the spring framework, that takes care of all of the setup.