Update samples and add to main solution

[JimBobSquarePants]

Prerequisites

• [x] I have written a descriptive pull-request title
• [x] I have verified that there are no overlapping pull-requests open
• [x] I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules :cop:.
• [x] I have provided test coverage for my change (where applicable)

Description

Updates the samples project to use the latest API and includes it in the solution so we don't forget about it in the future.

[codecov[bot]]

Codecov Report

Merging #157 (7bf8be5) into master (653cf5f) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #157      +/-   ##
==========================================
+ Coverage   69.87%   69.92%   +0.05%     
==========================================
  Files          88       88              
  Lines        5135     5144       +9     
  Branches     1048     1052       +4     
==========================================
+ Hits         3588     3597       +9     
  Misses       1337     1337              
  Partials      210      210              

Flag	Coverage Δ
unittests	69.92% <100.00%> (+0.05%)	:arrow_up:

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Impacted Files	Coverage Δ
src/ImageSharp.Drawing/Shapes/PathExtensions.cs	61.90% <100.00%> (+28.57%)	:arrow_up:

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