Prepare multitarget setup

[Simply007]

Motivation

Should fix #123

TODO:

• [x] Add information about target best practices.

Checklist

• [ ] Code follows coding conventions held in this repo
• [ ] Automated tests have been added
• [ ] Tests are passing
• [ ] Docs have been updated (if applicable)
• [ ] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[codecov[bot]]

Codecov Report

Merging #126 (f7df9bc) into master (a1b0278) will increase coverage by 0.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
+ Coverage   84.19%   84.29%   +0.09%     
==========================================
  Files          21       21              
  Lines         791      796       +5     
  Branches       81       81              
==========================================
+ Hits          666      671       +5     
  Misses        104      104              
  Partials       21       21              

Impacted Files	Coverage Δ
...e/Generators/Class/ManagementClassCodeGenerator.cs	100.00% <100.00%> (ø)

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[Simply007]

Information about projects targets: https://github.com/Kentico/Home/wiki/Kentico's-best-practices-for-.csproj-files#target-framework