Adding contributions accepted into "the algorithms c#"

[RicardoRibeiroRodrigues]

PRs accepted:

• Feature: Absolute value Algorithm TheAlgorithms/C-Sharp#462 - skill 22
• Updating DOTNET version in CONTRIBUTING.md TheAlgorithms/C-Sharp#467 - Docs skill 45
• Adding the SoftMax Function TheAlgorithms/C-Sharp#469 - skill 22
• Feature: Wild Card Pattern Matching TheAlgorithms/C-Sharp#470 - skill 22

[fbarth]

@RicardoRibeiroRodrigues coloca na descrição do PR qual o skill_id que você adicionou, por favor.

[RicardoRibeiroRodrigues]

@fbarth feito