Add draft for constructors

Author: diehlpk

sources/modules/object-model/constructors.md

@@ -3,4 +3,100 @@
 _Skeleton descriptions are typeset in italic text,_
 _so please don't remove these descriptions when editing the topic._
 
-This topic is currently under construction and will soon be filled with information :)
+### Overview
+
+_Provides a short natural language abstract of the module’s contents._
+_Specifies the different levels of teaching._
+
+------------------------------------------------------------------------
+Level             Objective
+----------------- ------------------------------------------------------
+Foundational:      Declaration of constructors
+
+Main:              Initialization and overloading   
+
+Advanced:          TBD 
+
+------------------------------------------------------------------------
+
+### Motivation
+
+_Why is this important?_
+_Why do we want to learn/teach this topic?_
+
+Constructors are fundamental to generate objects from classes and structs, so understanding them is essential to work with objcets.
+
+### Topic introduction
+
+_Very brief introduction to the topic._
+
+### Foundational: Basic use of constructors
+
+#### Background/Required Knowledge
+
+A student:
+
+1. should know the notion of classes and structs 
+
+#### Student outcomes
+
+_A list of things "a student should be able to" after the curriculum._
+_The next word should be an action word and testable in an exam._
+_Max 5 items._
+
+A student should be able to:
+
+1. Add constructors to classes and structs
+2. Explain different types of initialization
+3. Explain compiler provided constructors when these are provided, what these do, and when these go away
+4. Explain differences between creating an object and declare a variable
+
+#### Points to cover
+
+* Overloading of constructors and default arguments
+* Copy constrcutor and destructor
+* Constructors can be used to initialize class members 
+* 
+
+#### Caveats
+
+_This section mentions subtle points to understand, like anything resulting in
+implementation-defined, unspecified, or undefined behavior._
+
+* programming user interfaces in C++ and in general require plenty of boiler plate code
+* API calls are specific to one library and might not be transferable to other libraries
+* Some libraries are written in C
+
+### Main: Command of supporting mechanisms and tools
+
+#### Background/Required Knowledge
+
+* All of the above.
+
+#### Student outcomes
+
+A student should be able to:
+
+1. add more advanced elements, like tables or images
+2. handle multiple windows
+3. show error and warning popups
+4. use different forms of IO, like keyboard, mouse, or touch pad
+5. explain basic of fonts and accessibility
+
+#### Caveats
+
+*  programming user interfaces is rather complex and might not applicable for most students
+
+#### Points to cover
+
+* More advanced API calls and design patterns
+
+### Advanced: Technicalities and tools
+
+_These are important topics that are not expected to be covered but provide
+guidance where one can continue to investigate this topic in more depth._
+
+* Internationalization
+* Font designers
+* Hardware acceleration
+* Custom widget generation